Resourse allocation to project WBS

SAP Gurus,

I am working on a project to replace Primavera with CA PPM for PLC.  Resources will be assigned in CA PPM and sent to SAP via integration interface.  In order for the resources to enter time for a WBS or multiple WBS for different projects, where in SAP should resources be stored?

Resources will need to charge time to projects using CATS.

Thanks

Shirley