Glad to hear to again from you, @mb722.
I'm here to share additional insights on how you can create and build your inventory assembly items.
To cover the labor cost in packing your item and other fees, you're correct in creating a service item for it.
You'll also need to create an inventory item for each item or raw material that will be part of the inventory assembly.
Here's how to add an inventory item:
Once completed, you can now create the assembly item with the service item on it.
By following this process, you'll be able to track the total cost for each item included on each assembly.