The Parametric Design Solve and Auto commands operate only on the current Creo Elements/Direct Drafting part, and only on the portion of that part which is included in a zone that you define. The zone mechanism allows you to apply parametric design to sections of a part, leaving the remainder untouched. By including only those sections that require parametric design in the zone, you can often significantly reduce the number of constraints you need to assign as well as shorten Solve times.

The zone is implemented via Creo Elements/Direct Drafting info text. Zone commands are used to add or remove the info text PD_ZONE to geometry elements in a part. Parametric Design will only operate on elements that have the PD_ZONE info text. Sections of the part that do not have this info fall outside the zone and are never modified by Solve, remaining fixed in place. The Zone options are:

When you start Creo Elements/Direct Drafting, the zone is empty. By default, elements you Create during an Creo Elements/Direct Drafting session are automatically added to the zone, but geometry you Load from unconstrained files is not included. Zone commands add, remove, and display elements in the zone.