(Kinda urgent!) Help with WE (terrain stuff)

Im doing a map (Rpg/mod)
But i got a problem.. i need terrain from different tilesets. How do i do this? I know it should work somehow.. can sombody help me? i would be very glad! :ggani: :ggani:

Thanks in advance!

Menu: Advanced - Modify Tileset

.. ok sometimes i have to admit.. im stupid emote_sweat

Thanks Ligature