You can use two catalog database files when working with an AutoCAD Electrical project: the first file can contain the catalog information that you commonly use, and the second file can contain the full list of catalog content available with AutoCAD Electrical.
Project Settings dialog box, Catalog Lookup File Preference section, click Other File. For each project you set up this file for, you only see the content from your default_cat.mdb file in the Catalog Browser dialog box. To include catalog information that is in the full catalog database file (full_catalog.mdb), check Search secondary database.