Tips and tricks
Excel - how to add a string after 2 or 3 position in columns
You need to write this macro in Visual Basic
Sub replaceat()
Dim rng As Range Dim
cl As Range
Set rng = Range(Selection.Address)
For Each cl In rng.Cells
cl.Formula = “=Replace(“”” & cl.Value & “”” ,3,0,””.””)”
Next
End Sub
Then you can execute it on any selection via the Developer > Macros menu