Open an order, then scroll to the Dropships and purchase orders panel and click Create backorder. Any remaining unverified/unshipped item quantities will be automatically suggested while creating the backorder PO.

From the processing orders page, select the orders you want to backorder, then click the Actions button and select Create backorder.

The Create backorder option in the Actions menu on the processing orders page.

Enter the details and suppliers for the backorder items, then either email the backorder to your suppliers with Send or create it for later handling.

Use reorder rules to automatically suggest the backorder quantities you need for any open orders. Start by configuring your account's reorder rule.

After configuring your account's reorder rule, you can create a purchase order for backordered stock:

1. Go to the Purchasing page and click the New PO button.

The New PO button on the Processing tab of the Purchasing page.

2. On the Create purchase order window, optionally enter a PO # (leave it blank to auto-generate), then select a store, supplier, and warehouse.

The Create purchase order window. This older screenshot shows separate Add Item and Add Kit buttons; they are now one Add items button, with Add kits in its dropdown arrow.

3. Click the Add items button.

4. Click the Filters button and check Use suggested quantity. Click apply at the bottom of the filters dropdown. The values in the Qty column fill in automatically. To list only the items that need reordering, also check Only show suggested > 0.

The Filters dropdown in the Add item window. This older screenshot shows the option as "Automatically suggest re-order quantity"; it is now named Use suggested quantity.

5. Click the Free column to sort the Add item table by ascending count (lower numbers at the top).

Tip: You can change the number of entries displayed on the table (Show x entries) as needed to include all items that have negative free quantity.

Set Show entries to a higher number so every backordered item fits on one page.

6. Enter the Rates (cost assigned to the supplier item) for any rows with missing rates.

7. Click Save to add the backordered items to the PO.

8. Click Save on the Create purchase order window to create the PO.