I appreciate you for going into further detail on what you're trying to accomplish, gerdgoebel.
Using the Memorized transaction feature in QuickBooks Desktop is the best way to handle gift sets. This automatically enters the transactions you tagged as memorized.
Also, you'll want to enter each item in the Sales Receipt to make sure taxes are correct for each of them.
To do that:
Learn more about managing memorized transactions in QuickBooks Desktop through this article: Create, edit, or delete memorized transactions.
To review your memorized transactions at any time, you can go to the Lists menu and select Memorized Transaction List.
If you have other concerns, you're always welcome to post in the Community.