AutoCAD MEP 2022 toolset part catalogs are typically organized in chapter folders grouped by related parts. Within the chapters reside part families that store individual part sizes. A part family is a group of related part sizes. The following example shows the organization of a pipe part catalog.
Example of US Imperial pipe parts catalog
You can browse part catalogs through the Add and Modify dialogs, which give you direct access to the parts currently available to integrate into your designs. When you select a part from a part catalog, you are selecting a specific part size that is defined in a part family.
In the Add Multi-view Parts dialog box and Multi-view Part Modify dialog box, you can also use the Part Filter tab to specify part properties to query a part family to find a specific part size. You can view the part sizes available in a part family by clicking Details. The available part sizes are presented in an easy-to-navigate part size table. Select Display/Hide additional parameters to show all the parameters in the table.