How To Enable DFF On Promise To Pay Page - Mass Promise Region ?

Goal:

How To Enable DFF On Promise To Pay Page - Mass Promise Region ?

Presently there is no text field available to capture additional information on 'Promise to Pay' page.

User wants to capture some descriptive information while creating Promise to Pay activity under Promise Details area & Mass Promise area eg: If the promise has been made by the Management / higher level employee from the customer other than the contact person or any notes based on the discussion.

The DFF should be available whether the Promise is for one Transaction or Multiple transactions.