Using Loop Macros with RefEdit controll in userform

Hi Guys

im trying to use a userform with 2 refedit controlls on it, one is input ant one is output.
I have what i need to do down ok when only using one cell per refedit

but here is where i am struggling

I want to make it so if i select multiple cells it will do the process for each cell and output accordingly.

the way i am doing it at the miniute is

For Each Cell In Range(RefEdit1)
Range(RefEdit2).Value = Cell
Next

but i dont know how to reference to a cell in the second range (it just uses all of them at once)

the only way i can think of doing this is to use a collection but this caould be a bit more long winded that i would like.