Add an item to the top of the queue

1.        Click on --- Top of the Queue ---.

2.        Click on an item in the inventory, then click the Add button or double-click on the item in the inventory list.

⇒        To add additional units, keep clicking the Add button or double-clicking on the item in the inventory list.

Large orders
Pressing CTRL+SHIFT when clicking on the Add button will add as many of that item as possible. This also works if you press CTRL+SHIFT and double click on the item.