I have two suggestions that would make utilizing the Master Order much easier.
First, I'd love to have a "clear all items" options. Some times you goof and clicking the delete icon on 500 items is an incredible waste of time. So is creating the PO's and then archiving all those created PO's.
Second, we use it with three stores. Two stores feed off the main store, so we use and add transfers to the Master Order. We do our transfers by vendor and sometimes we'll end up with 20 or more transfers for each store. Currently, you have to manually add each transfer to the master order. Again, a huge clicking task. It would be great to be able to click a checkbox and then add all.