Select right side of currentcell when combo changed

If you would like to select "right cell" (my best guess: on the right side of current cell), you need to set DataGridView.CurrentCell Property (System.Windows.Forms) | Microsoft Docs[^]
Get and Set the Current Cell in DataGridView Control - Windows Forms | Microsoft Docs[^]

[EDIT]
OK, seems you want to change Enter key behaviour... I'd suggest to use KeyUp event.

Private Sub DataGridView1_KeyUp(sender As Object, e As KeyEventArgs) Handles DataGridView1.KeyUp
    If Label1.Text = "0" Then Exit Sub

    If e.KeyCode <> Keys.Enter Then Exit Sub
    Dim dgc As DataGridViewCell = DataGridView1.CurrentCell
    If dgc Is Nothing Then Exit Sub


    Dim c As Integer = dgc.ColumnIndex + 1
    Dim r As Integer = dgc.RowIndex - 1
    If c > DataGridView1.Columns.Count - 1 Then c = 0 : r += 1
    If r < 0 Then r = 0

    dgc = DataGridView1(c, r)
    If dgc Is Nothing Then Exit Sub

    Me.DataGridView1.CurrentCell = dgc
    Me.DataGridView1.CurrentCell.Selected = True
End Sub

You can create custom DataGridView control based on existsing one and then change Enter key behaviour in OnKeyUp event. See: Enter Key in DataGridView : C# 411[^]