Like if I got 100 of item and I wanna separate it two stacks 50 each!
STRG+pull it with the mouse in another empty slow
or Shift+mouse is single movement
Yes, you can separate stacks:
1. Alt+ left click into empty space. From there you can input the amount you wish.
2. Ctrl(Strg)+ left click into empty space. This will cut your items in half.
3. Shift+ left click into empty space. This remove by one.