If all of the inventory on a stock transfer is not yet ready or available when you pick the stock transfer, you can configure Inform to spawn a new stock transfer for the remaining products.
To do so, set File > Company > Master: Spawn New Transfer for B/O items after Shipment Confirmation to Y.
When you enter initials in the Picked by field on the Stock Transfer, Inform will spawn a new Stock Transfer for any unpicked items remaining on back order. The new Stock Transfer is created with the same Notes, Warehouses, Writer, and Consolidate settings as the original.
See also