To assign a combination of product group and discipline to a project, use the A.20.07 Project/Product Group screen. Product group/disciplines must be assigned to a project to make them available for user securities and hence for use in the project.
If you are logged in to a product group, all records of this product group and of all projects assigned to this product group can be deleted. If you are logged in to a project, only records of this project can be deleted, except the record with the discipline you are currently logged in to.
Records can only be deleted when no user securities exist referencing this project/discipline.