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

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