Use
If you want to combine a number of items in a sales document so that they are delivered together, you can create a delivery group.
Prerequisites
For correlated schedule lines in bills of material (BOMs) in delivery groups, there are certain prerequisites for the delivery group.
These are as follows:
In Customizing for item categories, you can control that the system should generate correlated schedule lines for the delivery group. You can do this by selecting A in the Generate delivery group field for the item category in the bill of material main item.
See also:
Combining Sales Document Items for Delivery