It's really basic but surprisingly fun

Sub BoldDups_TwoLists()

 

    Dim iListCount As Integer
    Dim iCtr As Integer
   
   
    ' Turn off screen updating to speed up macro.
    Application.ScreenUpdating = False
   
    ' Get count of records to search through (list that will be made bold).
    iListCount = Sheets("NEW RBS").Range("D7:D3030").Rows.Count
   
    ' Loop through the "master" list.
    For Each x In Sheets("Payments Recieved").Range("A1:A931")
   
        For iCtr = 7 To iListCount
       
            ' Loop through all the cells in the 'D' column (Row 4)
            If x.Value = Sheets("NEW RBS").Cells(iCtr, 4).Value Then
                ' We have a match. Make the cell bold
                Sheets("NEW RBS").Cells(iCtr, 1).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 2).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 3).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 4).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 5).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 6).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 7).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 8).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 9).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 10).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 11).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 12).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 13).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 14).Font.Bold = True
                Sheets("NEW RBS").Cells(iCtr, 15).Font.Bold = True
               
                            
                Exit For
            Else
                ' The Cells don't match
            End If
       
        Next iCtr
      
   
       
    Next
   
    Application.ScreenUpdating = True
    MsgBox "Done!"

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