Importing custom TF2 maps (hammer) into Garry´s mod; best method to do so?

[DrVincentWolf]

I want to create a map in hammer and open it up in Garry´s mod. The method I tried so far is creating the map, compiling as a bsp, creating a gma file and uploading to the workshop (as private since I do not want anyone else to download it). I then subscribe to it and try to open it in Garry´s mod. However, when I do so the program crashes halfway through loading. Do this has something to do with the fact that newer TF maps cannot be opened in Garry´s mod due to be compiled differently or should I use some other method of importing the maps?

[Rubat]

All new TF2 maps compiled with TF2 hammer are incompatible with Garry's Mod. You don't need to do anything related to workshop to install maps into Garry's Mod.

[DrVincentWolf]

Aww, that sucks. I suppose there is no way to use TF2-resources with hammer set to another game?