How do you tell the GTP to use the different category of files you upload in the knowledge base? For example: file A, File B : those are "data of users", use

How do you tell the GTP to use the different category of files you upload in the knowledge base? For example: file A, File B : those are "data of users", use them to do "Y" file C, File D : those are "data of buildings", do "X"