You can define a default connection type. To create a default connection type between two objects, double-click a cell between the objects.
Procedure
The From symbol column represents the source symbol type, the Connection type column the relevant connection type, and the To symbol column the corresponding target symbol type, as connections are differentiated by direction.
You have defined a default connection type.
This connection type can now be created between objects by double-clicking a cell in the matrix model. If you disable the check box in the Display column for this connection type, check boxes in the Default column are also disabled.