#1. Yes they can. You need to enter them into the Items, Traits, and Skills lists within FG and not on the individual characters. You can then Export these into custom modules you can load within your other campaigns.
#2. The GURPS ruleset doesn't have official support from SJG, so you can't buy modules with this content ready to go. We ALL wish we could. Maybe one day. The good news is you can easily create these modules yourself using utilities created by people in this community. See this thread (
https://www.fantasygrounds.com/forum...g-n-drop-items)
Side note: Use GCA or GCS and import your characters into FG. It's a huge time saver.
Hope that helps.