I could scavenge the following bit of code:

```
    Private Sub Worksheet_Change(ByVal Target As Range)
    If Not Intersect(Target, Range("G8")) Is Nothing Then
        ThisWorkbook.Sheets("Költségvetés").Range("H8").Value = Target.Value * 12
    End If 
End Sub

```

It works fine, however, I want to automatically enter the value of each cell times 12 from G8:G21 to H8:21, and also if I enter a value into H8:21 range it automatically enters the 1/12th of that value into G8:G21. So if either one get edited it automatically overwrites the other one as well.

Each cell should be "linked" to its neighbor, like G8 to H8 and so on.

How can I modify this bit of code to do my bidding?