General Question regarding Conditional Format

[Livin404]

I have PDF that I save from a Database. This PDF is then saved as an Excel Worksheet which is then pasted on my Excel Worksheet. At this time I launch a series of macros. Part of this process Rows are being inserted, deleted, moved etc. On one of these columns I created conditional formatting rules so cells in Column M would highlight in yellow based on the height of Column A. However, it seams the conditional formatting is lost along the way. Is there another way I can have a conditional format remain intact without trying to figure out a VBA to use in it's place?

I tried to improve on the Macro to input base on the height of Column A. This macro is: Again, I hope I can use the conditional formatting.

Thank you,

Sub highlighting_Cells()
Dim rng As Range
Dim rngcell As Range
Dim row_count As Integer
Dim ws As Worksheet

Set ws = ThisWorkbook.Sheets("Outbound")
ws.Activate


row_count = WorksheetFunction.CountA(Range("A1", Range("A1").End(xlDown)))
cond_count = 0

Set rng = ws.Range("M5:N" & row_count)
For Each rngcell In rng

If Cells(rngcell).Value = "" Then
  cell.Interior.ColorIndex = 6
  End If
  Next
  
End Sub