[rogbar]

The trick is to create the columns as text or number columns (or whatever), then make sure when you want to sort one column that the other columns have "None" as the "Keep Sorted" value.

For instance, if you select a text column, then right-click it to get the context menu and select "Keep Sorted: Lowest to Highest", then you will not be able to sort by a number column until you de-select this "Keep Sorted" from the text column.

Hope this helps.