Lisaj,

It appears that no-one understands what you are asking.  The appear to think you want to group all rental activities as one activity for material participation.  You want to combine a rental property with a an operating activity (like a dental practice) where the taxpayer owns the rental property and leases it to his/her dental practice.  The code clearly allows you to combine this properties as one economic unit, but there does not seem to be a way for proseries to allow the program to group the two activities.  

Have you found an answer yet?