Multi-building Site

Hello all:

Currently, I'm using ABD SS5.  I've been working on drawing up, in 3D a medium size site that has a number of buildings on it.  Some of the buildings are connected, and some are independent.  Work on this project has spanned the past 15 years.  Yes, I've gone through a number of MS upgrades.

Is it possible to back fit BB-Floor Manager to these existing designs?

Thanks for the help.