Can't have props in spawn menu

Hi,
I got some props from a TF2 server and I added them to GMod but them problem is I can only spawn them using the console and I want to know how to add them to the spawnmenu.

Pretty sure if you go through the TF2 files on the lower part of the spawnmenu, they should be in there somewhere.

No I tried this but I can’t open the ‘custom’
Is there anyway to make them shows up with a spawnlist ?