Please I need help to make this macro smarter-Offset problem

I have this small macro:

Sub addtest()
Dim myselection As range
Set myselection = Selection
On Error Resume Next
Dim column As range
For Each myc In myselection
myc.Offset(0, -2).Value = myc.Value

Next
End Sub

My selection is Col L so myc.offset will be J. I need to use in Offset formula not
-2 but reference to column J so if myselection is other column than L say AB automaticaly will refere always to Offset Col J.

I tried:

Sub addtest()
Dim myselection As range
Set myselection = Selection
On Error Resume Next
Dim column As range
For Each myc In myselection
myc.Offset(0, column(J)).Value = myc.Value

Next
End Sub

but doesn't work. Thanks