belong under

belong under (something)

To be properly categorized under a certain status, heading, or title. When you files these documents, they belong under "July 2008." What heading does that paragraph belong under? That department always belonged under the CFO, they're just making it official now.
See also: belong
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

belong under something

to be classified under some general category. This one belongs under the other category. This file belongs under A.
See also: belong
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also: