Merging content types?

Hi all,

I have a D5 mid-size site. Over the last 2 years, we have been using 2 content types as the electronic version of hardcopy publications (Reports). One is for a Report Summary and another one is for a Paged Report. The second one was made a different content type mainly because at that point we migrated content from word files using a .pl script and the xslt_book module. Long story short, now I want to merge both of the content types, any suggestions on how to proceed?

Thanks!