I'm wanting to add a spell to a set of existing Bracers of Armor +2. Do I use the caster level of the Bracers for the spell effects or the lowest possible CL for the spell?
The spell is Long Arm, for reference.
BoA have a caster level of 7.
Well, you need GM permission to make a custom magic item like that, so you'll need to ask them what the CL of the final item is and use that. (And the GM will use the same CL in determining the price of the new ability.)
If you want more responses I suggest reposting in Rules Questions, as this subforum is actually for the Pathfinder 2nd Ed Playtest and not many people are still reading it.