The formations mod is amazing. It’s clean, super easy, and works brilliantly. I don’t remember a formations thing for Heroes 3 so maybe you’re misinterpreting what it does. You setup the group in your stash screen like normal and their loadout. Then you hit save 1. You have multiple save slots, so you can instantly switch from skeleton setup (heavy with maces and no ranged units) to raiders (diverse weapons with plenty of ranged) to undead (no ranged lots of cleavers) to Alps (no armor and all swords/spears).