Summary
The requirement is to execute one of two different calculations based on the value of a Boolean variable (isCustomer). In a Calculation Procedure, this conditional logic is implemented using the "Conditional Step" property on individual Calculation Steps. This allows the procedure to evaluate a condition for each step and only execute that step if the condition is true, providing a clear, structured way to handle branching logic.

Correct Option

A. Use two separate Calculation Steps with the Conditional Step property selected: use the ISTRUE (isCustomer) and NOT (ISTRUE(isCustomer)) functions in the Condition syntax.
This is the correct and most explicit method. It involves creating two distinct Calculation Steps.

The first step has its Conditional Step property enabled with the condition ISTRUE(isCustomer). This step's formula will only execute if isCustomer is true.

The second step also has Conditional Step enabled with the condition NOT(ISTRUE(isCustomer)). This step's formula will only execute if isCustomer is false.

This ensures that only one of the two calculations runs, providing clean and reliable conditional logic.

Incorrect Option

B. Use two separate Calculation Steps with the Conditional Step property selected: reference just the isCustomer variable in the Conditional syntax (no comparison necessary)
This is incorrect. The condition field must evaluate to a Boolean value. Simply referencing isCustomer without a function or operator is syntactically invalid in the condition syntax. The condition must be a full expression, such as ISTRUE(isCustomer).

C. Use two separate Calculation Steps with the Conditional Step property selected: compare the isCustomer variable directly to the literal true and false values in the Condition syntax.
This approach is flawed. You cannot compare a variable directly to the literals true or false in the Calculation Procedure's condition syntax. The correct way to check a Boolean variable is to use the ISTRUE() or ISFALSE() functions. A direct comparison like isCustomer == true would not be recognized.

D. Use a single Calculation Step with an IF statement directly in the formula definition to reference the isCustomer variable and conditionally perform the appropriate calculation.
While a single complex formula with an IF statement might work in some contexts, it violates the principle of using the dedicated "Conditional Step" feature for this purpose in Calculation Procedures. Using Conditional Steps is the more declarative, manageable, and best-practice approach for this scenario, as it keeps the individual formulas simpler and the logic flow more visible.

Reference
Salesforce OmniStudio Developer Guide: Calculation Step Properties

Explanation

If an OmniScript (OS) needs to be reused across many customer interactions—especially as a common step like updating billing information—the correct way to invoke it is using an OmniScript Action.

Why OmniScript Action?
An OmniScript Action allows you to:
- Launch one OmniScript from another
- Reuse a common OmniScript as a sub-flow
- Maintain consistency across multiple customer journeys
- Avoid duplicating logic

This is the intended approach when a process (like billing updates) is reusable and shared across many user flows.

❌ Why the others are incorrect

B. Custom Action
Custom Actions are used mainly in FlexCards, not OmniScripts.
They are for FlexCard buttons, not for embedding or reusing an OmniScript.

C. Lightning Action
Lightning Actions are for Salesforce Lightning pages, not for assembling OmniScripts together. They don’t enable reuse inside OmniScripts.

Summary:
This question evaluates the correct JSON structure to display contact and case information in a Salesforce environment using the DRGetContactDetails action. The task is to match the JSON with a Repeat Block (BlkCases) containing multiple case records, ensuring all six values (Contact Name, Contact Phone, Case Subject, Case Number, and two case instances) align with the UI labels.

Correct Option:

A. Option A
Option A correctly structures the JSON with "BlkCases" as a Repeat Block containing an array of case objects. It includes "CaseSubject", "CaseNumber", "ContactPhone", and "ContactName" with values "Cannot track our order.", "00001002", "(212) 189-8797", and "Leanne Tomlinson" respectively, matching the UI display for two case instances.

Incorrect Option:

B. Option B
Option B lacks proper array notation under "BlkCases" and only includes one case object, missing the second case instance ("00001004"). This fails to represent the Repeat Block structure and does not display all six values as required.

C. Option C
Option C includes two case objects but incorrectly nests "CaseSubject" and "CaseNumber" under separate objects, breaking the expected structure. It also duplicates "Billing status" incorrectly, leading to inconsistent data display.

D. Option D
Option D uses "Subject" instead of "CaseSubject" and lacks proper nesting under "BlkCases" as a Repeat Block. This mismatch with label names and incomplete array structure prevents correct display of all six values.

Reference:
Salesforce Help: Data Loader and Integration

Summary
When a FlexCard field displays its label but no value, it indicates a successful data retrieval at the card level but a failed data mapping at the individual field level. The FlexCard's DataRaptor runs and fetches data, which is why other fields populate. However, for the specific field showing only the label, the connection between the DataRaptor's output and the card's element is broken, typically due to a name mismatch.

Correct Option

B. The field name in the FlexCard state does not match the DataRaptor Extract’s Output JSON Path name.
This is the most direct cause. Each element on a FlexCard (like a Text element) has a "Property" setting that maps it to a specific node in the JSON data provided by the DataRaptor. If the property is set to AccountNumber but the DataRaptor's output JSON path for that value is Account.AccountNumber (or simply AccNumber), the mapping fails. The element renders its label but finds no data at the specified path, leaving the value blank.

Incorrect Option

A. In the Setup Panel, {recordId} is misspelled in the Data Source Input Map.
A misspelled {recordId} in the Data Source Input Map would cause a complete data retrieval failure. The DataRaptor would not receive a valid record ID and would return no data, resulting in all fields being empty, not just a single field.

C. In the FlexCard state, the Field type for the field does not match the type in the Salesforce record.
FlexCard elements are generally type-agnostic when displaying text. They interpret the data from the DataRaptor as a string for display purposes. A type mismatch might cause formatting issues but would not typically prevent any value from being displayed at all. The label would still show, and some representation of the data (e.g., a number as text) would usually appear.

D. There are No test Data test Parameters configured.
Missing test parameters would prevent the FlexCard from loading any data during preview in the builder. The scenario implies that testing is occurring and that several fields are displaying data correctly, which means the DataRaptor is successfully running and the test parameters are likely configured.

Reference
Salesforce OmniStudio Developer Guide: Troubleshoot FlexCards

Explanation:

When you need to calculate a sum of a field across multiple records (like BasePrice), the most efficient approach in OmniStudio Expression Sets is to use an Aggregation Step.

Why Aggregation Step?
Aggregation steps are specifically designed to perform aggregate functions on collections of data.

Supported functions include:
- SUM()
- AVG()
- MIN() / MAX()
- COUNT()

The Aggregation Step can process the entire array of records in one operation, making it efficient and declarative.

❌ Why the other options are incorrect
A. Sub Expression step as SUM(BasePrice)
Sub Expressions are designed for intermediate calculations within a single record or value.
They are not efficient for summing across multiple records.

B. Calculation Step as SUM(BasePrice)
Calculation steps perform field-level arithmetic, usually on single values.
They do not automatically aggregate a collection of records.