How to delete objects separated by polygroups

[zsun]

I would like to delete only the objects circled in red in the image below
What methods are there?

[Spyndel]

Hello @zsun ,

You could:

1. Familiarize yourself with the shortcuts for polygroup visibility, hide the target polygroup and use Tool> Geometry> Modify Topology> Delete Hidden.

2. Split the meshes into separate subtools with one of the functions in the Subtool> Split menu, and then delete that subtool.

3. For low-poly meshes separated by polygroups, you could also use Zmodeler> Polygon> Delete> Target: Polygroup all.

[zsun]

Thank you!