You can open the Catalog Editor from inside or outside of AutoCAD MEP.
To open the Catalog Editor from inside AutoCAD MEP
- Click

.
To open the Catalog Editor outside of AutoCAD MEP
- On your desktop, open My Computer.
- Navigate to the \Program Files\Autodesk\AutoCAD <version>\MEP folder.
- Double-click AecbCatalogEditor.exe.
Note: To close Catalog Editor, click File menu

Exit, or click the “X” on the right side of the title bar.