While on the Parts Management page (Management Module / Parts / Manage Parts), the navigation panel on the left side contains two ways to look up parts:  Categories and Groups. Both of these are similar and it is important to properly understand the difference.

Part Categories       
A single part can be assigned to multiple categories making the part easier to find for users. Categories are used throughout the system to organize parts. You can filter and sort by categories while creating an order, viewing queues, and creating reports. Click on the "+ Manage" button under the Categories tab to add/delete categories.

Examples:  Cut Vinyl, Print Vinyl, Envelopes, Banners, Electrical, Frames, Tradeshow, Vehicle, Decals, Services

Part Groups       
A part can only be assigned to a single group. Part Groups only appear in the Management Module's Manage Parts section. Groups are used to quickly assign common settings across all parts in a group. The shared settings are the ones found in the tabbed section below the part name list. Be aware that when adding a part to a group, the added part automatically inherits the common group settings, overriding the previous settings. Click on the "+ Manage" button under the Groups tab to add/delete groups.

Settings that parts in a group share: Discounts, Margins (if cost-plus), Setup Fees, Income Accounts, just to name a few. 

Examples:  Intermediate Vinyl, Premium Vinyl, Reflective Vinyl, Installation, Design