How would I define an X position from your mouse and define it like in a part CFrame? And no I do not expect a script I just want to know if it is possible
You could do like
mouse.Hit.p.X
or with a part you could do
part.Position.X
Note: - You can not set this value, you can only set another value based off of this value. So, for instance, you can't do part.Position.X = 5, but you could do part.Position = Vector3.new(part.Position.X + 5,0,0).