Connect constraint enables to connect existing contraints to a selected relation OR existing relations to a selected constraint

The option is only enabled when:

or

When selecting the menu option after selecting a relation, a dialog will open enabling you to select one or more not yet connected constraints to connect to the relation

 

When you select a contraint a description is provided on the right side.

When selecting the menu option after selecting a constraint, a dialog will open enabling you to select one or more not yet connected relations to connect to the constraint

 

When you select a relation a description is provided on the right side.

As mentioned before, always try to connect existing constraints before creating a new one...

 

Quaestor Interface | Constraint>