narrow down

(phrasal verb) to focus or define the choices available

Example Sentences:

Before the Smith family chose their vacation, they had to narrow down their options.

The University student narrowed down his career choices to doctor or lawyer, but was having a hard time choosing one.

A: What classes are you going to take next semester?
B: I’m not sure. I plan on narrowing my choices down over the next few weeks.

From the News:

Genetic tests narrow down source of SARS

Media: