Copy and paste rows between worksheets - excel

Question

What I want to achieve is to copy data from WS1 to WS3 based on certain criteria.
I have 2 worksheets:
WS1 = RAW DATA
WS2 = ATLAS DATA
In columns A of both there are unique identifiers. What I want to do is to create WS3=Reconciliation. Then look up values in WS2 against WS1. Where a match is found I want to copy row(s) from WS1 to WS3 that all
I have reverse engineered some code and came up with one below
Sub CopyAndPaste()
Dim x As String, CpyRng As Range
Dim mFIND As Range, mFIRST As Range
With Sheets("RAW DATA")
Range("A:A").Select
On Error Resume Next
End With
With Sheets("ATLAS DATA")
Set mFIND = .Range("A:A").Find(x, LookIn:=xlValues, LookAt:=xlWhole)
If Not mFIND Is Nothing Then
Set CpyRng = mFIND
Set mFIRST = mFIND
Do
Set CpyRng = Union(CpyRng, mFIND)
Set mFIND = .Range("A:A").FindNext(mFIND)
Loop Until mFIND.Address = mFIRST.Address
CpyRng.EntireRow.Copy Sheets("Rec").Range("A" & Rows.Count).End(xlUp).Offset(1)
End If
End With
End Sub

Answer 1

Based on your description of your problem; try this
Option Explicit
Sub CopyAndPaste()
Application.ScreenUpdating = False
Dim i As Long, j As Long, lastRow1 As Long, lastRow2 As Long, cnt As Long
Dim ws1 As Worksheet, ws2 As Worksheet, ws3 As Worksheet
Set ws1 = ActiveWorkbook.Sheets("RAW DATA")
Set ws2 = ActiveWorkbook.Sheets("ATLAS DATA")
Set ws3 = ActiveWorkbook.Sheets("Reconciliation")
lastRow1 = ws1.Range("A" & Rows.Count).End(xlUp).Row
lastRow2 = ws2.Range("A" & Rows.Count).End(xlUp).Row
cnt = 1
For i = 1 To lastRow1
For j = 1 To lastRow2
If StrComp(CStr(ws2.Range("A" & j).Value), _
CStr(ws1.Range("A" & i).Value), _
vbTextCompare) = 0 Then
ws1.Activate
ws1.Rows(i).Select
Selection.Copy
ws3.Activate
ws3.Range("A" & cnt).Select
Selection.PasteSpecial Paste:=xlPasteAllUsingSourceTheme
Application.CutCopyMode = False
cnt = cnt + 1
End If
Next j
Next i
Application.ScreenUpdating = True
End Sub