The main problem can be broken down into several sub-problems.

The sub-audible sound was barely noticeable.

The sub-municipality is responsible for managing local services.

There are several sub-municipalities in the city.

There are several sub benches in the park.

Florida has a sub-tropical climate with warm temperatures year-round.

Florida has a sub-tropical climate with warm temperatures year-round.

I love growing sub-tropicals in my garden.

The navy awarded the contract to multiple sub tenders.

The website is divided into various sub-elements.