You can rename them to a different UPK. So IIRC, you can rename them into your map, so you don't have an extra UPK. (i.e.-select your items in the Generic Browser, right click on them, and select Rename). I don't have UnrealEd on this machine, but that's it, I think.
Tadao215: As long as it's a texture map you can merely right click on the file in the generic browser and click export (from which you can select the file type of TGA, etc).
EDIT:
P.S. you can also do this with exporting meshes to OBJ format.
There are two kinds, things can be a simple/cheap mask or they can be translucent (looks nice, heavier performance hit).
If I had UnrealEd on this machine I'd post a pic of it. There's a drop-box in the bottom of the material editor (when no nodes are selected) where you can select if it is masked or translucent, and depending on which one you choose, you connect your alpha/opacity map to that node in the editor window.
Replies
EDIT:
P.S. you can also do this with exporting meshes to OBJ format.
if you got the time to tell people you got it to work you should really share it
If I had UnrealEd on this machine I'd post a pic of it. There's a drop-box in the bottom of the material editor (when no nodes are selected) where you can select if it is masked or translucent, and depending on which one you choose, you connect your alpha/opacity map to that node in the editor window.
Edit:
Or, for a more in-depth description, a tutorial from Hourence.
http://www.hourences.com/book/tutorialsue3mated.htm