I don't quite understand how to do it. Help would be nice.
Get the horizontal size of the part, half it, then decrease the horizontal position of the part by it
e.g
Part1 = --The Part you want the very bottom position of Part2 = -- the part you want to move to the bottom of part 1 Half = Part1.Size.Y/2 Part2.Position = Part1.Position -Vector3.new(0,Half,0)