Hello PK,
The new Custom Action to Import change into Pre-Prod can be added to the corresponding action profile. This Action to set the new Custom Status "Pre-Prod" can be scheduled for a specific status (For example: Successfully Tested) with the appropriate Schedule condition. Then in addition to this add the entry for the Custom status "Pre-Prod" with the action "IMPORT_TEST" in the Change Request Management Framework settings.
Example: E0005 10 IMPORT_TEST (for Transaction type ZMHF)
This should help you to meet your requirement.
Revert back if you need any additional details.
Regards,
Kathir