Extracting in FI and CO

Dear Friends,

During the process of blueprinting the ETL process in BW for FI and CO, i have seen that there are many InfoCubes in the business content for a same area (for example in Controlling Analysis for CCA there are about 5 Infocubes). How do we know what is being used in SAP R/3 so that we can activate on the relevant InfoCubes and their datasources. Thanks for all the help in advance.

Mike