Force rows to be child rows on table and below breakpoint

I have a responsive table with 9 columns

Using the responsivePriority I can set which columns display

What I would like is to force the table so that once the viewport is below 992px (so I can set my own custom breakpoints), only columns 2 and 3 display and all other columns become child rows

I'm looking for the none class but only on certain breakpoints

I've got the .Responsive.display.childRowImmediate property set, so I am not worried about the control column as the table will always be expanded

I just cannot work out how to set the classes on the columns to achieve this result

Mike