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[deep relic]

You mean how to mount portal 2 to gmod hammer?

Unless you dont wanna mount the whole game but just use some of the models, in that case you can use crowbar to extract them and their textures from the vpk of portal 2

[deep relic]

Ok so you wanna mount portal 2 to gmod hammer, and then if you wanna run the map with portal 2 assets, you just gotta mount it to gmod. And no, someone cannot run it without portal 2 unless the assets being used were bundled with the map or packed into it

To mount it to hammer and gmod itself you gotta find mount.cfg in the cfg folder