WebDynpro Services / Floor Plan Manager -- E-Rec

We are trying to customize the candidate profile for the external candidate. The customer is on EhP4, SP4 and we use WD4A services. Since the floorplan manager is being used, can you tell me how the custom is done and redeployed.

I am not mentioning about new roadmap steps -- it is the changes being done (fields being added / hide, etc) and being redeployed.

You can also direct me to any resource that might be available

Thanks again !