How to use process configurator to calculate retention on an invoice point?

Summary:

Project process configurator provided in this link:https://www.oracle.com/webfolder/technetwork/tutorials/tutorial/cloud/r13/wn/ppm/releases/21A/21A-ppm-wn.htm#F16624

provides only configuration. There is no other documentation on how to use the configurator to derive the amounts.

Content (please ensure you mask any confidential information):

Specific use case includes generation of a retention amount against an already invoiced amount (can be amount based or rate based ).

Example- if a 10% retention has been defined on a DFF on bill plan, then the same should be used to generate a negative amount.

Total Invoice amount= USD 1000