Need help finding how data is loaded?

Good Morning All,

I have a database in the warehouse and the tables are getting loaded from sources using stored procedures. In the analysisn services database i have DIMESNIONS and FACTS which are using these tables. In MS when i click on  server agent jobs i see 12 steps which all are transact sql statements for example "exec dbo.usp_DIM_Address". So i was wondering where to look for to know how the data is getting loaded from the source to these warehuse tables. Where should i look for the stored procedures?

Thanks

SV