I am a new seller and my first product has four variations: all just differences in the quantity. On my inventory page, which lists the parent listing and the four variations, only the parent listing shows as having an inventory. All of the others are listed as out of stock. This is confusing to me in the first place because they are all the exact same item so they should all be in stock. I don't know how to change this. When I view the live listing, it doesn't show the variations, only the parent. I thought the parent wasn't even supposed to be an actual item, and that it was only supposed to represent a family of items. Can someone help me change this?