Background:

I am the only CAD operator in my office, and I have a standalone install of SW2015 Premium.

Situation:

I want to add a fastener that I created from scratch to my toolbox however I can't add folders to the toolbox (by right clicking) or specify the toolbox as a destination when I go to add the fastener to the library; the toolbox does not show up on the folder list. The toolbox does show up in my design library and I'm able to drag and drop parts, I just can't seem to be able to add to the toolbox. Any ideas?