'Find last row in column B
Dim myLastRow As Long
myLastRow = Cells(Rows.Count, "B").End(xlUp).Row
'Select last 10 rows in column B
If myLastRow >= 10 Then
Range(Cells(myLastRow - 9, "B"), Cells(myLastRow, "B")).Select
Else
Range("B1:B" & myLastRow).Select
End If