Adding Multiple Items from the "New Order" Page
Search for each item you would like to add on individually under Select Items.
Add on Items, one at a time.
You will see these items show up on the right hand side under the Summary
Adding Additional Items to an Existing Order
Under Item Summary, press "Add Item."
Search for the Item that you would like to add.
Press "Submit" in the top right hand corner.
The added item's dates will default to be the full order length. You can later edit these dates.
See below for a visual representation of adding an item to an existing Order.