Exactly like the title reads, please give us this:
For example, we could put up 3 stacks of 10 Copper Ore at once instead of having to do it 3 separate times.
BONUS SUGGESTIONS:
1) please keep the GC Item Exchange Window open when we open the Market Board Window (or give us the option in UI Customization to check what windows we want to temporarily close when opening others').
2) please remove a couple of the pop-up windows asking if "we're sure" we want to make a purchase... specifically, the one about not being able to equip the item currently & the one about taxation.