Why do you need this? Generally what I suggest, if you want to sell inventory using journal entry, then you will have to record full transaction, that is:
- Credit
inventory on handasset (this is where you choose inventory item) - Debit
inventory - costexpense - Credit
inventory - salesincome
and finally debit whatever asset account which has increased as a result of inventory sale.
The only issue right now is that Inventory - sales and Inventory - cost accounts have special meaning in Manager and journal entries can’t see these two accounts but that will be changing in upcoming days and you will be able to debit/credit those accounts as well.