I've been creating groups for inventory items that make up finished products we sell.
One item is used in a few different end products. That item is set up.
When the group it constructed it will take with the first group for that end product.
When trying to use it in a second group QB asks if want to set up that inventory item, even though it has already been set up.
If one closes out of QB and goes back in to set up a new group that item is now available to use in this next group's end product.
Each time a new group is constructed for an end product that is using that inventory item one needs to close out and then reopen QB in order to enter it is as a component of that new group.