I'm guessing no one but me cares (or even reads this forum), but interestingly the ability to type in a specific quantity exists in the Ship Replicator function. Surely it'd be easy to add that functionality to the Banks.
If your on pc, hold down control on keyboard, then with mouse drag and drop from fleet bank to inventory.
A pop up will appear asking how many you would like to split from that bunch..
Then use the slider to choose your amount..
Yes, I know. The problem is that the slider is very "coarse" - you cannot choose a specific number of things you want. That's why there should be the little box in which you can type a number, just like in the Ship Replicator function. Try using the slider when there are hundreds or even thousands of items in the stack (R&D stuff).
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A pop up will appear asking how many you would like to split from that bunch..
Then use the slider to choose your amount..