I haven't installed PS26 yet because my wife bounces between PS19 and PS23 on her computer depending on the project she's working on.  I would like to uninstall PS19 and PS23 then install PS26 and have the two databases merged together so when she runs PS26 she can see the bins and work that was done with the prior versions.

Does Pinnacle have a way of doing that yet or am I going to have to leave PS19 and PS23 then add PS26? 

I'd test PS26 thoroughly before uninstalling past versions of PS. I still have PS23 on my computer.

citapinc:

...Does Pinnacle have a way of doing that yet or am I going to have to leave PS19 and PS23 then add PS26? 

Simple answer: no there is no way to import the database content from the older versions

Complicated answer: There are a few unofficial/unsupported ways by which you might be able to move the library content belonging to an older version into a newer one - for example replacing the newer version's database with the one copied from the older version... I've done that in the past to carry-forward the library content from one previous version; don't know how you could merge the databases from two old versions.

FWIW, if you have PS23 (and PS26) Ultimate, keep PS23 installed when you install PS26 as some of PS23 Ultimate's bonus content (no longer provided in later versions) will migrate at install-time and be usable in PS26 Ultimate.