What is the gmod prop directory?

What is the gmod prop directory?
am trying to find them so I can add more props to flood mod
so can anyone please or post them or post a link.
and if anyone can add me and help me:
steam: yaseenxx
thanx

It’s in the Gmod .GCF

[editline]04:22PM[/editline]

But to add models you can use Steam/steamapps/username/garrysmod/garrysmod/models