To manage returns of your products made to the consignment store, you can raise a credit note directly from the invoice of that sold unit, and identify the quantities to return to your consignment store's inventory.
From within the [OT] click the Invoice menu, then select ['Add Credit Note']
The Credit Note 'Order Details' will pull through from the Invoice
On the Products Tab, you can dictate the quantities the consignment store will be credited for (the unit/s returned):
Once the quantities are returned and received, click 'Back to Stock' - Click [Save]
Here you can enter in the quantities to send back to your CONSIGNMENT stock as this stock has been returned to the consignment store and held by them.
Note: This will not create an adjustment within your product stock inventory as with when you send units back to stock within a return authorisation ; as this stock will remain within your consignment customers possession.