This section is devoted to methods that allow the construction of a new Group by selecting entities associated to other entities of the finite element model. For all these methods, the association is checked by inspection of the finite element model stored in the DataBase. Therefore, these methods are defined in the specialized version of the “DataBase” class. Therefore, these methods are systematically defined in specialized versions of the “DataBase” class. For each supported solver, a description of these methods is given. (See Part III.)