Is it possible to mass replace doodads or change the initial cliff level of a map?

Can I modify the initial cliff level of a map I've already started work on? and Can I mass select a doodad, like trees and replace them all with winter trees?

You could pick every tree, make a new tree at that trees position, and then remove the picked trees. That would probably lag though.

Advanced -> adjust cliff levels...
Advanced -> replace doodads...

Thx, btw when copying and pasting, is it possible to adjust where you are locked onto when copying a large region? When I try and copy and paste a huge area of doodads from one of my map, I seem to be locked to a certain position when I try and paste it, which makes it an absolute pain in the ass to try and line it up properly with my terrain, and if I try and zoom out everything goes black and I can't see.

either use Advanced -> View Entire Map to line things up, or to remove black shroud thingy, hold Ctrl (I think) and scroll your mouse wheel.

Oh... I misread, I thought you meant after the game has started...