Open Garry’s Mod
Open the main menu
Click the sandbox or map-related option you need
Open the console with `~`
Use `map
If you have a workshop scene, subscribe to it in Steam Workshop
Restart Garry’s Mod after subscribing
Open the map or scene from the addon list if available
If importing a custom scene file, place it in the correct Garry’s Mod addon folder
Enable the addon in the Addons menu
Load the map again
Use the spawn menu to place props, NPCs, or entities if needed
Save the scene with the save menu if you want to keep it
Use `gm_save` or the in-game save options if available
Check that all required content packs are installed
Verify the scene works in the correct game mode or map