Repeat Column (not page) headings

I have a three column report and trying to find a way to repeat a group heading if column data overruns into multiple columns. Using the example below, looking to have Col 2 start with --A-- and Col 3 start with --B--. My current version looks like example at this time. Thanks if advance for any assistance.

i.e.

Col 1 Col 2 Col 3

--A-- A4 B3

A1 --B-- --C--

A2 B1 C1

A3 B2 C2