I made a few boulders by mistakes and now I can not store them anywhere. They seem to be in a category of their own (Catapult Ammo, Neolithic, Boulders) and this category doesn't exist in the store list (whether shelves or zones or whatever).

Now I have 5 ugly ass rocks in the middle of my beautiful workshop and I don't know how to get rid or move them.

Is there a mod to just delete an item? Or is there another solution?