If this is a table view, the order or columns isn't dynamic, it's fixed based on the order the columns are places into the table view. Only the rows could be sorted in a different way.
More in general you seem to be wanting to sort based on the value of a total row, if that's the total OBIEE does calculate automatically when you decide to display a total, you can't do much with it, you can't reference it for a sorting or anything else. If this is your case, even without the limits of a table view you wouldn't be able to set a sort based on the total as it doesn't really exist anywhere in your analysis. It's just a visual element.