Configuring Numbering and Versioning Schemes
You can configure the number and versioning schemes used to uniquely identify parts, documents, and other objects in the organization. The organization context inherits the site-level schemes, but can optionally define its own schemes. In general, when a company is hosting Windchill for its internal users, the numbering and versioning schemes should be defined at the site level; you should not override the site-level schemes by defining schemes at the organization level.