VBA Code replacing values in column D if cell in column c - excel

Question

I am new to VBA and i tried to create i sub that will update (with vlookup and then copy paste) the comments with new comments from another sheet depending on the case status ("Open"). Basically i tried to put together a code that inserts new rows at the end of the table with a vlookup macro.
The main problem is that i do not know how to instruct excel to identify in which cell he should do the lookup and then copy and paste. As in the example below "M528" will not do it as i want to keep the records that are closed as well. I receive daily only the open cases so therefore i don`t want the code to do any vlookups in those cells where the status is "Closed"
Sub ChangesUpdates()
lastRow = Worksheets("CurrentDash").Range("A" & Rows.Count).End(xlUp).Row
For r = 2 To lastRow
If Worksheets("CurrentDash").Range("AS" & r).Value = "Open" Then
Range("M528").Select
Application.CutCopyMode = False
Application.CutCopyMode = False
ActiveCell.FormulaR1C1 = _
"=VLOOKUP([#[Parent Case Number]],NewData!C[-12]:C,13,0)"
Selection.Copy
Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
:=False, Transpose:=False
End Sub

Answer 1

Without changing things too much, you can do most of what you want with
Sub ChangesUpdates()
lastRow = Worksheets("CurrentDash").Range("A" & Rows.Count).End(xlUp).Row
For rw = 2 To lastRow
If Worksheets("CurrentDash").Range("AS" & rw).Value = "Open" Then
With Worksheets("CurrentDash").Range("M" & rw)
.FormulaR1C1 = "=VLOOKUP([#[Parent Case Number]],NewData!C[-12]:C,13,0)"
.Value = .Value ' effectively a paste-values
End With
End If
Next rw
End Sub
There's no cell selection/activation here so the screen won't move to the updates, but it should cycle through the same set as your routine.
There's some remaining question in my mind about how stable the lookup area is, which you should think about.