You should be able to customize those Flexviews and "save as" to something else. I think you know well how to do that based on the previous flexview you created. So I would modify as needed and test.
But in general, to add a column, you would open flexview->Properties->Columns->Find OID->Click New
See below - #2 and #4 are outputs of arrows #1 and then #3.
You can then drag and drop those columns around till it's visually pleasing.