In , all functions should allow for the addition of multiple computed/calculated columns contained within a span. E.g. a function to add an average column to the table based on specific, selected, columns, should be repeatable within the function, and allow the user to specify a label for the group of columns thus created.

Currently, due to having column labels repeated among spans, the function will return an error saying it is inappropriate to use this rule.

I would like the new 'Difference' column to automatically nest under the wave1 subtitle instead of being a standalone column. More broadly, rules that add columns (or rows) to a table should be movable and it should be possible to place them within existing spans.

This would help in making the report data look clean and neat for the client.