FGD problem

Hi all, I have a problem with FGD files: can I “extend” an already existing entity declared in “halflife2.fgd” to my custom FGD?
I don’t want to rewrite all the references, it would be way more comfortable if I could add my own inputs without creating a new entity. :smile:

Why not add the hl2 fgd to hammer as well as any others you need?