Any Way to Combine Maps?

[Curio]

When I say combine I mean merge, not, like, the Combine.

[Curio]

Originally posted by Murizath:

Well it matters on what maps you chose. Hammer has a limit so you can't combine 2 huge maps together. Other than that I think you would have to open both of the maps in hammer.

This, of course, has occured to me. However, Hammer doesn't . . . OPEN the files that all my maps are. (Huge noob, here, so bear with me.)