After creating a lookup relation on an MDA Data - Object, in the report builder you can use the MDA Data - Object to generate a report. For more information on how to create a lookup relation on an MDA Data - Object, refer Adding Custom Fields in an Object > Enable Lookup section in the Gainsight Data Management article.
The following image highlights how various collections such as Account Name and Active User are related to MDA Usage Data.
Note: You will be provided with only 2 sub-level objects containing lookup relation. For example, in the following image MDA Usage Data > Account Name > Active User, where MDA Usage Data has a lookup relation on Account Name and Account Name has a lookup relation on Active User. However, you cannot have an MDA Data - Object containing lookup relation at the third sub-level, such as MDA Usage Data > Account Name > Active User > [Another Collection Name containing lookup relation].
Sample Use Case
You might want to generate a report on the number of CTA Type Names that have been generated by Industry. In this report Base CTAs::Industry is a child of CTAs, which contains CTA Type Name.