One card per parcel. Copy or send the details to whichever courier is taking it, then mark it dispatched.
On the shelf
Out with partners
Sold to date
Sold by shelf
Stock leaves a shelf when you mark an order Dispatched or Delivered — whichever comes first, and only once — and goes back on if it is Returned. An order is served from its own state when that hub has the units, otherwise from central. Every change is logged in the "Stock moves" tab.
Five units parked with a partner in each state, so a customer is served from inside their own state instead of waiting on a parcel from Abuja.
Sending stock out moves it off the central shelf and onto that state's shelf. Dispatching an order takes it off the state shelf automatically — and falls back to central if that hub is empty.