Software (include version): DocStar
Use Case: Datalink useful in field group. Based on user selections following fields are filtered.
Example: User selects a Company, then the Account drop down would only show Accounts available for the selected Company. Then the Subaccount drop down would only show Subaccounts available for the selected Account, etc.
Prerequisites: Datalink license
See video under Helpful Links
Beginning of video shows them setting up a database table (useful to understand the step) - the middle to end shows how to build the cascading datalink in DocStar
Helpful Links: Cascading Datalink Video