Hi @mikeg, at the moment it is not possible to directly import the point cloud classification from Pix4Dmapper into Pix4Dsurvey. For example, if you import the Pix4Dmapper project or the point cloud generated in Pix4Dmapper, the classes are not recognized.
As a workaround, I would recommend exporting the point cloud from Pix4Dmapper interface. You can select which classes are exported. This way you will be able to only export the classes that you edited. More here: How to export the Point Cloud.
I can understand the need to define the area you are interested in and only generate results there - actually, it’s already reported, and you can up vote it in Implement Clipping box post.
Best,