Getting Started documentation wrote:...
Browse to \BF2ModTools\data_abc\_Build
Run ModTools VisualMunge.exe from inside this folder.

...

The term “munge” is the term that we use for basically compiling your data for use in the game. We’ll get to actually modifying your new world in a bit, first I’m going to cover munging, and running your new level in the game.

So, by now you should have opened VisualMunge from inside your new mod folder, and you’ll notice that all the Munge options have been enabled, and the Create World options disabled. Your new level will automatically show up in the Worlds drop-down menu, and the only other option that should be selected by default is Common. You can leave everything as is when you run the program. Note: you MUST have your world selected in the worlds list in order for everything to munge and copy correctly.

Click Munge.

Once VisualMunge finishes working it’s magic, you’re all done. You have a level that you can run, and play in the game. Visual Munge copies all the necessary files for running your level into your Battlefront II folder in the following location: \Star Wars Battlefront II\GameData\Addon\ABC (where ABC is the 3-letter name that you gave to your level). Run the game, and your new map should show up in the Instant Action, and Multiplayer playlists.