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Hey there, @Idevore.
How's your day going? I hope all is well.
Great news, you can delete the assembly item and reuse the number. However, if that assembly item has been used in a transaction, QuickBooks will not allow you to delete it for accounting purposes.
Check out: Add, edit, and delete items for more details about deleting items in QuickBooks.
Please let me know if you have further questions. I will be here to help you out. Have a good one!