Product: QuickBooks Enterprise
Article Link: http://help.truecommerce.com/en/articles/7950916-quickbooks-enterprise-importing-a-warehouse-shipping-order
A Warehouse Shipping Order (940) is generated by importing a Sales Order from QuickBooks Enterprise to create a copy of it specifically for your Warehouse or 3PL to receive.
You'll simply need to create a Sales Order within QuickBooks Enterprise and set the Warehouse Code within the Other field for it to be ready to be turned into a Warehouse Order.
For More Info on Creating Warehouse Shipping Orders
See the below article
Importing into Transaction Manager
Since your Warehouse Order is just a copy of your Sales Order you'll want to set the Transaction Type to Sales Orde in order to find an available order to import.
Transaction Type: Sales Order
Document Number (Optional): Set to Contains to filter by Document #
Transaction Status (Optional): All Txns (All Transactions) if previously imported
Select: Search
Import Selection
You can now proceed to select the orders you wish to import by checking them off on the left hand side - then selecting Import
Additional Resources