Trying to combine two reports in SPM 5.3 (FF) what are the table name(s)

Hi, I am trying to combine the Log report and the Reason/Activity report of certain tcodes launched by Firefighters and am finding it is extremely time consuming to try to do this with Excel. We have a list of critical tcodes that we feed into the Log report we run, then we run the reason/activity report for that same time perios and have to do a bunch of manual data manipulation steps which is very time consuming. I'm thinking it may be easier to do this from the table level since the report I am looking for does not exist in SPM. Any ideas? Thanks!