This was the best I could do:
In ZeroEditor I loaded cor1.lvl (the coruscant map) and overwrited my own abc.lvl with it. As the Getting Started documentation said, I copy all the things to the right places from coruscant level directory to my new level directory. After that, if I open my new map in ZeroEditor It perfectly looks like the coruscant map in every way. I munged it as the documentation says. But when I open my map in the game it's a f*ckin empty map only with green grass and the command posts like it was when VisualMunge generally created it.
I really need some help with it, please.