Try this:
Sub ConverReferenceType()
On Error Resume Next
Set myRange = Application.Selection
Set myRange = Application.InputBox("Select one Range that you want to covert reference type:", "ConvertReferenceType", myRange.Address, Type:=8)
Set myRange = myRange.SpecialCells(xlCellTypeFormulas)
myIndex = Application.InputBox("Select a reference type from below list:" & Chr(13) & Chr(13) _
& "Absolute = 1" & Chr(13) _
& "Row absolute = 2" & Chr(13) _
& "Column absolute = 3" & Chr(13) _
& "Relative = 4", "ConvertReferenceType", 1, Type:=1)
For Each R In myRange
R.Formula = Application.ConvertFormula(R.Formula, XlReferenceStyle.xlA1, XlReferenceStyle.xlA1, myIndex)
Next
End Sub
If you don't want the reference box to appear you can comment out this line:
'Set myRange = Application.InputBox("Select one Range that you want to covert reference type:", "ConvertReferenceType", myRange.Address, Type:=8)