All this data is potentially out of date, and should be taken with a truckload of salt
For most people stacking items is a click of a mouse. But, Unstacking your Items is a little more confusing. Expecially for someone who is new.
So, How do you unstack your items in your station items list? Simply choose which item your interested in unstacking. ( click it so it's highlighted ) once you have the item of interest highlighted hold the [shift key] + drag any direction. (<-"Left" or "Right" ->) A diolog box will appear with a prompt asking you to input a number.
Thats it! Now you can unstack some items for easyer transport.