There is an issue like this for the C API in the GitHub issue tracker: C API Feature Request: SUComponentDefinitionCreateGroup() · Issue #51 · SketchUp/api-issue-tracker · GitHub
I found an internal issue logged as SU-28030 for the Ruby API.
There is an issue like this for the C API in the GitHub issue tracker: C API Feature Request: SUComponentDefinitionCreateGroup() · Issue #51 · SketchUp/api-issue-tracker · GitHub
I found an internal issue logged as SU-28030 for the Ruby API.