Supplies and Demands table in SCP - lookup table to add more fields?

Summary:

Customer wants to add more fields in the Supplies and Demands table for Supply Planning and Replenishment Planning

Content (required):

Is there a lookup table in Setup and Maintenance to do this? I checked all tasks in Supply Chain Planning setup, but found no lookups

Version (include the version you are using, if applicable):

21C

Code Snippet (add any code snippets that support your topic, if applicable):