Hello,
For the CO tables, SAP has provided the following reports to use to analyze which archive objects are most relevant to your CO data. They are:
RARCCOA1 - creates an extract of the CO data
RARCCOA2 - evaluates the data in the extract
Depending on the size of your tables, you may want to run these reports in a system that is a recent copy of your production system (if you have one).
Hope this helps.
Best Regards,
Karin Tillotson