Yup. Clue is in the title. We can move parts of stacks using the Bungie app and the old gear manager, so why can't we do it now?
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Definitely planning to make this easier! You actually can do it right now, but it's a little annoying. If you inspect a stackable item and transfer from that window, you'll have the option to split up the stack.
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Use the companion app. I know it's a pain. But it can be done.