Ideally, feral cats should not be relocated from their territory. Unless they are threatened or their environment is in danger, the best place for them to live is in their current location. Alley Cat Allies shares some tips on how to relocate a colony, however, should the need arise.
Relocating_Feral_CatsSafe Relocation of Community Cats
When, and how, to relocate feral cats if it becomes absolutely necessary.