Reuploading since all links on internet are dead.
Riu's Zone masher allows to move and merge adts, maps for 3.3.5(Wotlk), might work with Vanilla/Tbc as well.
Original release post here : https://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-model-editing/wow-me-tools-guides/301186-rius-zone-masher-alpha.html
If you're getting some missing DLL error, you probably need to download "Microsoft Visual C++ 2010 Service Pack 1 Redistributable"
