How to Select Multiple Groups to Copy/Paste to Another Project?

[Cyrix]

I want to duplicate part of the project to another project.
However, when I use mouse to select multiple groups, it wasn't successful.

Is there a way to select many parts of the projects (with or without the arrows) for copying / deleting?

Thanks.

 

[bigcajones]

You can copy one group at a time, but not groups of groups with their connections.