3. Exporting the prefab

Total War WARHAMMER II\assembly_kit\raw_data\terrain\tiles\battle\_assembly_kit\[yourmap]

<ECFileLayer export="true" bmd_export_type=""/>

<ECFileLayer export="true" bmd_export_type="catchment_01"/>

Total War WARHAMMER II\assembly_kit\working_data\terrain\tiles\battle\_assembly_kit\[yourmap]

Go back to the raw Terry files inand open the .terry file of the map, and look for the ECFileLayer.ChangetoIt should now look something like this:Save the file, then re-open the map it in Terry. The Default layer should now have - catchment_01 behind it's name, as you can see here:After opening the map, group your prefab and subtract 142 from the y value of the prefab. Then ungroup. Save, and then export the map.The description, author, and max players don't matter. You can close Terry now.Go to the working data folder and find the exported files, the path is (replace [yourmap] with the key of your map):Copy the catchment_01_layer_bmd_data.bin, and paste it into the 'prefabs' folder which you made earlier.Rename catchment_01_layer_bmd_data.bin to [nameofyourprefab].bmd. In my case that was ksl_wall_straight_20_b.bmd, which is also the name I used when I saved the map.That means that we're changing the extension of the file from BIN to BMD. Your computer might ask you if you're sure that you want to change the extension. You are sure, so go ahead and change it., the terry files which we prepared in step 2 are only used to display the prefab in Terry.