Create rules to filter emails

1. Open Gmail.
2. In the search box at the top, click the Down arrow .
3. Enter your search criteria. If you want to check that your search worked correctly, see what emails show up by clicking Search . 
4. At the bottom of the search window, click Create filter with this search. 
5. Choose what you’d like the filter to do.
6. Click Create filter.

Note: When you create a filter to forward messages, only new messages will be affected. ​Additionally, when someone replies to a message you've filtered, the reply will only be filtered if it meets the same search criteria. 

Use a particular message to create a filter

1. Open Gmail.
2. Check the checkbox next to the email you want. 
3. Click More.
4. Click Filter messages like these.
5. Enter your filter criteria.

<source: https://support.google.com/mail/answer/6579?hl=en>