Constraint Manager is built upon Constraints Sets - collections of constraint values that can be applied to Nets, XNets, Diff Pairs, Classes and Class-to-Class Relational Spacing Objects.
CCS has complete tools for easily creating new CSets, and for reading, displaying and editing existing Physical , Spacing and Electrical CSets. No PCB Editor License is required.
CSets are the only way to define Physical and Spacing constraints by layer. CCS supports both by-layer CSets for specific stackups, and Generic Constraint Sets for use without a specific stackup.