You can modify an object's properties from its property sheet. To open a group particle property sheet, double-click its diagram symbol or its Browser entry beneath its parent object. The following sections detail the property sheet tabs that contain the properties most commonly entered for group particles.
| 
                             Property  | 
                        
                             Description  | 
                    
|---|---|
| 
                             Type  | 
                        
                             Type of the group particle. You can change its type by selecting a value in the list and clicking OK  | 
                    
| 
                             Minimum  | 
                        
                             Minimum number of times the group particle can occur. To specify that the group particle is optional, set this property to zero  | 
                    
| 
                             Maximum  | 
                        
                             Maximum number of times the group particle can occur. For an unlimited number of times, select unbounded  | 
                    
| 
                             ID  | 
                        
                             ID of the group particle. Its value must be of type ID and unique within the model containing the group particle  |