An object can be in any number of projects and a project can also be included in more than one Project Group.

Performing a drag and drop from one group to another group simply creates an additional Project > Group Mapping.
To move a project from one group to another group:

  1. Copy the project by dragging the project from one group to the other group.
  2. Remove the project from its original group by right-clicking and selecting Remove Project from Group.