Parametric constraints maintain relationships between an object and world space, between two objects, or within the object itself. There are two types of parametric constraints: dimensional and geometric. Dimensional constraints maintain a measurable relationship by limiting the object’s geometry to a particular value. Geometric constraints maintain a physical relationship by limiting the allowed orientation of objects.
Parametric constraints can be placed on all 2D objects. They cannot be placed on 3D objects except for walls, symbols, and plug-in objects that have 2D components. Multiple constraints can be applied to an object. Parametric constraints can be placed across layers as long as both layers are in a Top/Plan standard view, are of the same scale, and Layer Options are set to Show/Snap/Modify Others.
Constraints attached to a single object move along with the object even if the object is copied or cut and pasted. When only one of a pair of constrained objects is duplicated or copied or cut and pasted, the constraint is removed.
When a parametric constraint is placed, red constraint indicators are drawn for the object(s) involved. To hide indicators, deselect Show parametric constraints in the Display tab of the VectorWorks preferences. Alternatively, select View > Show > Show or Hide Constraints; the command toggles between displaying or hiding constraints, as appropriate.