Than go under the 1st dialog mentions and click modify tileset. Than replace and add tiles that way. You just cant change cliffs, so make your base tilesat the one with the cliffs you like.
The easiest way I can think of would be to import the tile then overwrite the MPQ file path, there by making grass or something to wood panelling... I dunno, that's how I'd do it, though I've never tried to do it..
Ah sory about the misunderstanding. It sounded like you wanted to use a compination of tilesets for a forest map. Follow Eriond's instructions , that should do it...
Yeah, you do it just like you would a model skin, just import it and rename the file to the path of the tile you want to replace. You gotta restart WE after to see it just like a normal skin.
