Convert Stock Entry Package into 8 Items

Hello, I bought 54 packages with 8 items in each.
I created the 8xpackage product.
I created the 1item product.
I created a Stock Entry for the 54 packages. Now I am selling each 432 items separately, but I cannot find how to convert the packages into items.
Now I cannot now create delivery notes, since the items are not in my stock, and continue with workflow.

Thank you for your help

Check repack entry:

Also, you don’t need to create a separate item master for the package. You can also buy in a different unit: