How can I import my Tileset into NWMap?
From the File menu, select Add Tileset. This brings up a window where you can name the new tileset (e.g., “caverns”), and specify the path and filename of your tileset’s bitmap(s) (one bitmap per layer). Once you select a bitmap, it will appear in the window. You should define a GRP file and a TIP file for each layer (see the Tileset HOWTO).