Project Tasks, Key Members setup and Requisitions in iProc

Hello Experts,

I am looking for some reference document on setups and relation of Project tasks being charged in requisition. I am aware of of the option setups at Project Sub-task level where we check the check box to allow charging but how about Key Member setups and how buyers or folks are assigned, how security is maintained.

Please share your thought and references.

Cheers,

Neo