its on page 26, as said in the docs folder in your game files.
"5.1.1 How To Make Your Own Prefabs You can use the map editor to create your own prefabs. You must follow the steps below to ensure your prefabs are created correctly. 1. First click the File/New menu item to begin a brand new map - you must start from scratch when creating prefabs. 2. Select the segments you wish to use and paint them to the top left corner of the map. You can use any combination of segments such as rooms, corridors, doors and windows. You mustn o t use entities from the entities library for your prefab design.
3. You can design your prefab over several layers. We recommend a height of no more than five layers, beyond this and it becomes difficult to place such a tall structure from the top/down perspective.
4. When you have painted your segments, position the 3D cursor at the lowest layer, at the top left corner. 5. Now press “E” and select the entire area of segments that define the bounds of your desired prefab. You can use the - and + keys to move up and down the levels.
6. Once the whole prefab is surrounded by the copy selector, press CTRL+C to copy the selection into the clipboard. 7. Now press CTRL+J to launch the “save prefab” dialog. Choose a location and enter a name for your prefab remembering to end your filename with “.FPP”.
8. After the dialog, you will be presented with a screen where you can preview the prefab and zoom around with the camera using the W,A,S,D keys.
9. When you are happy with the view of the prefab, click the left mouse button to take a snapshot of the prefab. This image will be used as the thumbnail for the prefab.
10. You can now select the Add new prefab icon and you will find your prefab in the location you saved it to."
@bgrim
fpsc is a program for 20€, dont expect too much
create a test-level with 2 or 3 rooms, basic player marker and the surroundings that are basic for your game. then test new things you want to do there. when it works, do it again inside your gamelevels. thats my way to test out things.
