Creaphis
I will deliberately take a contrary position just for the sake of writing incredibly long arguments

Posts: 1387
Registered: 10-05 |
You assign specific iwads to specific mapping modes in tools -> configuration -> files.
Once you've selected your doom2.wad file for ZDoom (Doom in Hexen format) and you want to make a new map, then don't open doom2.wad in Doom Builder. Just click file -> new map. Select ZDoom (Doom in Hexen format) in the drop-down menu, and put "map01" in the "map name" box. When you want to save your map, use file -> save and call it anything you want. To play this map later, just drag that new file onto the ZDoom icon and start a new game.
By the way, this is fairly basic stuff you're asking. You should read the Doom Builder tutorial here:
http://drsleep.newdoom.com/data/doombuilderguide.pdf
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