This question should be posted on the Expedition Community http://communities.mentor.com/community/pcb/expedition/ask_the_insider?view=discussions&start=0 I'm sure the Expedition experts will be able to help you.
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First, Setup in Planes Classes and Parameters the 2 different classes that you wish to use. One with Buried Vias, One Without.
Then, In Plane Assignments, you can set by layer the Plane Class to use.
You can also set the Plane Class on an individual plane shape by editing the Properties of the shape.
Just like what Vern told ,You can assign different Plane classes to different Plane shapes for differrent via/pins thermal connection styles or use Parameter overrieds to change thermal connection style for specific shape. As you known, these setting ibe based on individual shape, you may use thermal overides for thouse via/pins in a spefic partition area of one shape.
Thanks Yu.Yanfeng and Vern_Wnek, It works now!