How to export model part above the ground plane only

[DanRathbun]

This has been asked for and discussed in the past …

• Outliner create slice group via API, somebody can help?
  (Note, I posted a Windows Only send keys hack in post 6.)

• Create Section Plane Programmatically?

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API Feature Request logged …

https://github.com/SketchUp/api-issue-tracker/issues/189