To create a snapshot transformation, select "Add → Snapshot Dimension" from the diagram context menu. This will open the Snapshot Transformation Wizard.

⚠️ Note: Only one snapshot dimension can exist in the data warehouse.

As shown in the image below:

Parameters

1. Schema
   The schema in which the snapshot transformation resides.
2. Name
   The name assigned to the snapshot transformation.
3. Stars
   The data mart stars where this snapshot transformation will be included.