This is a great technique to utilise if you have a Saved Search you know has contacts you are looking for, but you wish to narrow down those contacts to more specific criteria

First thing you are going to do is pull up one of your Saved Searches and select the one that you would like to work off of

Once you select the Saved Search that you would like to work off of, select the filters that you would like to add or take away (in this example we will be company size to broaden our search).

Once you have changed your desired filters locate the "Save" button in the bottom left corner of your screen.

Once you click the "Save" button you will be asked to "Enter a Name for your Saved Search" and save the search.

Once you have saved the new Saved Search you can locate it in your Saved Searches tab and you will see it listed with the rest of your Saved Searches.

The Black Arrow contains my original Saved Search and the Red Arrow contains my edited version of my original Saved Search.

This is a very helpful feature because you can still view your original Saved Search (with the initial filters you applied) as well as the new Saved Search that you created based on your original.