Narrow down
Definition 1 of 2
Pro Tip 1/3Decision Making
Use it when you're selecting the best option from many. 
Let's narrow down our vacation spots to two choices.
Pro Tip 2/3Problem Solving
Helpful in focusing on viable solutions when many exist. 
To fix the issue, we must first narrow down the causes.
Pro Tip 3/3Project Planning
Used when specifying the most critical tasks to start with. 
We need to narrow down our priorities for the project.