Use Cesium OSM Buildings in a specific area

Can I use Cesium OSM Buildings in a specific area?
For example, in area A, I want to use Cesium OSM Buildings.
in area B, i want to use Unity 3D Model.

p.s. I apologize in advance because I’m not good at English.

If the two areas are far apart, you can use Sub Scenes:

The idea is to put Cesium OSM Buildings in one sub-scene, and your other Unity models in another.

However, if your use-case is more along the lines of “remove a particular building from Cesium OSM Buildings to replace it with a more detailed model”, then you want to use a tile excluder. Details of that can be found in the PR where the feature was added: