Excel Macro to copy Multiple Columns and dynamic rows

Not really sure what your question is.  Are you saying that the NUMBER of rows change?  If so, then here's your answer.  I'm making assumptions here that the first row is always row 1; so you'll need to modify that isn't the case.  I'm also assuming that column 1 contains data for every row.  You'll need to modify if that isn't the case either.

Sub Macro1()
'
' Macro1 Macro
'
' Keyboard Shortcut: Ctrl+Shift+G
'
    iLastRow = iLastRowFilledInColumn(Me, 1)  ' see my function below
    stRange = "A1:C" & iLastRow
    Range(stRange).Select
    Selection.Copy
    Sheets("Sheet1").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
End Sub

Function iLastRowFilledInColumn(ws As Excel.Worksheet, iColumn As Long) As Long
    Dim iLastRow As Long
   
    iLastRow = ws.Cells(ws.Rows.Count, iColumn).End(xlUp).Row
    '
    ' If the entire column is empty, Excel still returns 1 even though
    ' there is no data in row 1.  Therefore, check to see if the
    ' cell is empty; if it is, return 0 instead of 1.
    '
    If iLastRow = 1& Then
        If Trim(ws.Cells(iLastRow, iColumn)) = "" Then
            iLastRow = 0&
        End If
    End If
   
    iLastRowFilledInColumn = iLastRow
End Function

This code worked perfectly. The previous post gave me errors. Thanks to both for the assistance. I will have another question soon. Similar to this one.