It would be wonderful if I could flag a specific category or sub-category as being low on parts.

We purchase quite a few items from NewEgg when they go on sale from various manufacturers. This results the shop stocking 2-5 different manufacturer's products that go in the same sub-category. For example, we have multiple inventory parts under DRIVES > 2.5" SATA HARD DRIVES. As a manager/owner, I may not necessarily care if we run out of a specific 2.5" hard drive, but do care if we are running low on 2.5" SATA HARD DRIVES in general. So, if we get down to, say, three 2.5" hard drives left in stock, RS would notify me to order more of these drives.