They can't be modified with Hero Lab like a standard weapon. With specific items, you can only add other properties through the editor. You would have to make a copy of the item, then add your additional powers and save that version.
Current RPG's: Pathfinder (GM), Pathfinder (Player), Gamma World (GM, Pathfinder homebrew).
HeroLab: 3.5 & Pathfinder. HL User Files for PF: Greyhawk Setting, Gamma World (WIP).
DM and player of D&D since 1980.
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