Manage Your Item Class
Use a predefined class or create your own for your configuration model.
Create your own class so you can manage your model independently of other models, such as how to number each unique configuration, specifying who can configure the model, specifying transaction attributes to store data that the flow creates at runtime, and so on.
For now, you will do the minimum setup you need to get started when you create your own class.
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            Go to the Setup and Maintenance work area, click Tasks > Search, search for, then open Manage Item Classes. 
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            On the Manage Item Classes page, in the search results, click Actions > Create. 
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            In the Create Item Class dialog, set the values, then click Save and Add Details. Attribute Value Item Class My Laptop Internal Name My_Laptop Description Class to use for the Build My Laptop model. 
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            On the Edit Item Class page, verify the options, then click Save and Close. Attribute Value Enabled Contains a check mark Item Creation Allowed Contains a check mark