I stopped transferring everyone in at once multiple years ago, too many "dead" clients that kept getting carried forward. I transfer clients in as they come in for their appointments now....makes a much more manageable Homebase.

There shouldnt be any reason for you to not be able to delete them from Homebase though, you cant do it from the EFCenter, but from a regular Homebase view you should be able to delete whatever file you'd like (assuming youre not on a network of some kind, or lack admin privileges...Im not sure how that works)