サンプルです。
Sub test()
Dim a As Range
Dim b As Range
Dim i As Long
On Error GoTo test_Exit
Set a = Application.InputBox("コピーするセル範囲を選択してください", Type:=8)
Set b = Application.InputBox("貼り付け先のセル範囲を選択してください", Type:=8)
On Error GoTo 0
For i = 1 To IIf(a.Count < b.Count, a.Count, b.Count)
b(i).Value = a(i).Value
Next i
test_Exit:
Set a = Nothing
Set b = Nothing
End Sub