Need to know where to start with an LGIM? Here is the ArcGIS Solution for Local Government get started overview.
This video is the most recent Getting Started with the Local Government Information Model - https://www.esri.com/videos/watch?videoid=2407&isLegacy=true This one is much older and may have functionality that doesn't exist today. It also has additional information about X-Ray that might be helpful. Introduction to X-Ray for ArcCatalog - https://www.esri.com/videos/watch?videoid=1497&isLegacy=true