You can link all your existing runtimes into the Poser 9 library.
Or, as you wish / want merge manually.
But first take a deep look at the new content organisation.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!