You can duplicate submitted or draft orders by using the 'Save As' menu option from the order you want to duplicate. To do this,
1. Open the order you want to copy.
2. Click on the Menu Button in the top-right corner
3. Select 'Save As' from the dropdown
4. You will be able to give your order a new name
You can access your new copy of the order under 'My Orders' in the Orders Widget. Copying a submitted order will create a draft (unsubmitted) copy.