How do i have an inventory that has efficient slots?

When i mean slots, i mean that they slide. I'll provide some images because i am terrible at explaining things.

here's the full selction 1

this is after i click 'light soldier' 2

and this is after i click the almost unreadable one 3

Notice how they all slide to the top?

The only way i would know how to do this is with a ton of ifs.

if not gui.Position == UDim2.new(0,13,0,123) then
	gui2.Position = UDim2.new(0,13,0,123)
end

Above is good enough for like 2 slots, but what if i had 20 or more? Just more if's is all i can think of. Can you give me a little demo of a more efficient way to do this?

Use a table

When you click one, you can remove the item from the position that it's at and put it in position 1. Then you can iterate through the table and reposition every single thing based on its new table position. If you use table.remove to remove the item and move it to position 1 then all of the entries will move themselves in the table.