This is a complex question that is not easily answered in a couple of sentences. Whether you use the information for underwriting or not, the regulations require that you gather required information. As far as what to report, I would refer you to the CRA FAQ:
§.42(a)—5: Should institutions collect and report data about small business and small farm loans that are refinanced or renewed?
A5. An institution should collect information about small business and small farm loans that it refinances or renews as loan originations.
§.42(a)(4)—1: When indicating whether a small business borrower had gross annual revenues of $1 million or less, upon what revenues should an institution rely?
A1. Generally, an institution should rely on the revenues that it considered in making its credit decision. For example, in the case of affiliated businesses, such as a parent corporation and its subsidiary, if the institution considered the revenues of the entity’s parent or a subsidiary corporation of the parent as well, then the institution would aggregate the revenues of both corporations to determine whether the revenues are $1 million or less.
Alternatively, if the institution considered the revenues of only the entity to which the loan is actually extended, the institution should rely solely upon whether gross annual revenues are above or below $1 million for that entity. However, if the institution considered and relied on revenues or income of a cosigner or guarantor that is not an affiliate of the borrower, such as a sole proprietor, the institution should not adjust the borrower’s revenues for reporting purposes.