The below will show you how to edit sales orders in Sales Invoice Manager.
Usage
Open Sales Invoice Manager.
Locate the order you wish to edit.
If the order is in a non-editable stage, drag and drop the order into Staging.
Open the order and enter Edit mode.
The order is now ready for editing, once the changes have been made and the sales order saved, you can either process the sales order from Staging again or move it back to the stage it was in originally.