Item (Charge) can be used to recharge the Labour Cost into the Item Cost.
Follow below Steps:
1) Search and create new "Item (Charge)'
2) Do Item Assembly (Assembly Order / Item Journal)
3) Create Transfer Order, transfer to another location
Post the Transfer Shipment & Receipt
4) Create a Purchase Order, choose the dumy Vendor (create one for this usage).
Input the line = Charge (Item)
Click "Item Charge Assignment"
Click "Get Transfer Receipt Lines"
Select the Tranfer Order