Narrow and Discard

At the bottom of your search results screen, click the "Refine" button.  You will find  "Retain Checked" and "Remove Checked" buttons in the blue bar. You can use these to help refine your search results.

Retain Checked: As you go through your search results, there may be only certain ones you want to keep. Click the check box next to each listing you want to keep. Click the "Retain Checked" button. This will remove all listings from your search results that you did not check, so that you can more easily focus on the listings that interest you. To return to the full list of results, click "Original Results" or "Search run at..." links at the top left of the screen.

Remove Checked: This is the opposite of "Retain Checked." Click to select any listings that you want to remove from your search results. Click the "Remove Checked" button. The listings you selected will be dropped from your search. After using the "Remove Checked" button, a new button will appear labeled "Restore List".  You may click this button to return your discarded listings to your results.