When working with library component, sometimes you may find the predefined view elements in the business view on which the library component is based cannot meet your requirements. In this case, you can create some dynamic resources and use them in the library component to get the desired data. Then when you save the library component, the dynamic resources will be saved along with it as its resources.
Dynamic resources are library component level resources, which means they are only available to the library component for which they are created.
Dynamic resources that can be used in library components include formulas and aggregations. For details about how to use them, refer to Using dynamic resources in web report.