I then select the one I want and either modify it directly or select use info for that one until I reach the level I want to mod. This brings up a list of things that that particular item is used in. For instance, I wanted to increase how many weapon mods a vendor carries to increase the odds that I'll find a mod I'm looking for so I went to the mod I wanted, right clicked, and selected use info.
Whenever I want to edit what a vendor has I always just go and edit it directly.
