Copy Union of multiple columns from one sheet to another - vba

Question

I wrote a code to copy Column D, H, M and paste it on a brand new sheet starting from A-C. I first find the last row , after that I Union the 3 column range together then select the sheet and paste it.
For some reason I don't understand why it does not work. I have never used Union range before so not sure if that is the problem, or if it is something like my for loop. Help would be appreciated.
Dim ws As Worksheet
Dim lastRow As Integer
'for loop variables
Dim transCounter As Integer
Dim range1 As Range
Dim range2 As Range
Dim range3 As Range
Dim multipleRange As Range
Dim lastRow1 As Integer
Dim ittercell As Integer
Set ws = ActiveSheet
For transCounter = 1 To 10
r.AutoFilter Field:=6, Criteria1:=transCounter.Value, Operator:=xlFilterValues
With Application.ActiveSheet
lastRow1 = .Cells(.Rows.Count, "AE").End(xlUp).Row
End With
Set range1 = Sheets("Sheet1").Range("D6:D" & lastRow1).SpecialCells(xlCellTypeVisible)
Set range2 = Sheets("Sheet1").Range("H6:I" & lastRow1).SpecialCells(xlCellTypeVisible)
Set range3 = Sheets("Sheet1").Range("M6:M" & lastRow1).SpecialCells(xlCellTypeVisible)
Set multipleRange = Union(range1, range2, range3)
multipleRange.Copy
Sheets("O1 Filteration").Select
'Range("A3").Select
'Range("A3").PasteSpecial xlPasteValues
ittercell = 1
Cells(3, ittercell).PasteSpecial xlPasteValues
ittercell = ittercell + 6
Next transCounter

Answer 1

There's a couple of issues with your code that might be causing the fault:
r is not defined in your code
use of transCounter.Value instead of just CStr(transCounter) (see #QHarr comment)
iterCell reset every iteration of the loop (see #QHarr comment)
Combination of ActiveSheet, unqualified Cells(... and manual Select on sheets makes the Range qualifications ambiguous
However, I do think the main logic of using Union, then Copy, then PasteSpecial is OK and just some tweaking is required.
Here is some working code where you update the Worksheet and Range references with your own. Please follow the comments.
Option Explicit
Sub CopyUnionColumns()
Dim wsSource As Worksheet '<-- Sheet1 in your code
Dim wsTarget As Worksheet '<-- O1 Filteration in your code
Dim rngFilter As Range '<-- main data range on Sheet1
Dim rngSource As Range '<-- to hold Union'd data after filtering
Dim rngTarget As Range '<-- range in O1 Filteration to paste code to
Dim lngLastRow As Long '<-- last row of main data
Dim lngCounter As Long '<-- loop variable
Dim lngPasteOffsetCol As Long '<-- offset column for pasting in the loop
' set references to source and target worksheets
Set wsSource = ThisWorkbook.Worksheets("Sheet2") '<-- update for your workbook
Set wsTarget = ThisWorkbook.Worksheets("Sheet3") '<-- update for your workbook
' set reference to data for filtering in source worksheet
lngLastRow = wsSource.Cells(wsSource.Rows.Count, 6).End(xlUp).Row
Set rngFilter = wsSource.Range("A1:F" & lngLastRow)
' initialise offset column
lngPasteOffsetCol = 0
' iterate rows
For lngCounter = 1 To 10
' filter data the data per the counter
rngFilter.AutoFilter Field:=6, Criteria1:=CStr(lngCounter), Operator:=xlFilterValues
' set source range as union of columnar data per last row
Set rngSource = Application.Union( _
wsSource.Range("A1:A" & lngLastRow).SpecialCells(xlCellTypeVisible), _
wsSource.Range("C1:C" & lngLastRow).SpecialCells(xlCellTypeVisible), _
wsSource.Range("E1:E" & lngLastRow).SpecialCells(xlCellTypeVisible))
' set target range on target sheet top left cell and offset column
Set rngTarget = wsTarget.Range("A1").Offset(0, lngPasteOffsetCol)
' copy source cells
rngSource.Copy
' paste to target
rngTarget.PasteSpecial Paste:=xlPasteAll
' increment offset
lngPasteOffsetCol = lngPasteOffsetCol + 6
Next lngCounter
' cancel cut copy mode
Application.CutCopyMode = False
' cancel autofilter
wsSource.AutoFilterMode = False
End Sub