Sorting records on print

I have a table that has a child table. The first table has the heading informtation for my report. It's child table has the line items for the report.
I can do this well, but I can't find a way to sort the line items. The line items has 5 fields or columns. I need to sort by 3 of those: task type; then Expected Completion; finally Complete.
THis will be the equivalent of a SQL Select order by (these can be nested or several listed).
I would apprciate some help in this matter.
Thanks very much!
Rosana