The Pipe Network Catalog Settings dialog is integrated with ProjectWise, so that you can open pipe network catalogs that are stored in ProjectWise (click the Browse button to the right of the Catalog folder field).

Two related options are available on the ProjectWise tab of the ribbon, Save Pipe Network and Import Pipe Network, allowing you to save changes to the pipe network catalog opened from ProjectWise, or so you can import a local pipe network catalog to ProjectWise.