Terrain Model by Fence

Does anyone know if its possible to make the Terrain Model by Graphical Filter tool honor a fence?  I want to create terrain models for features only inside a fenced area.  No matter what I do when using a graphical filter, it pulls in everything from the entire dgn.

Thanks in advance for any help.

Jason

OpenRoads Designer CE - 2021 Release 2 Update 10

Version 10.10.21.04