You would use a filter to do that. Click on the gear icon in the upper right corner of the page, then on Settings>>>>>Filter rules, and create your filter. Of course, you need to create the folder you want to use if you haven't already. To do that, in the folders pane click on the + sign to the right of "My folders" and follow the prompts. Or, you can right-click on any other folder and add another one. It just depends on where you want to put it.