This is the way
1) First open your new Gmail ID.
2) Then click on the Settings button seen on the right side.
3) Here you will find Forwarding and Pop/IMAP option.
4) After clicking on the forwarding option, you have to enter the ad forwarding addrace. Note that you have to enter your email ID on which you want to get a mail of second ID.
5) After entering the email ID, click on the Next button and then the Proceed option.

6) After clicking on Proceed you will get an email for verification on the new Gmail ID. Gmail users have to click on Verification Mail.
7) After verification, now come back to the Gmail setting page and refresh the page once again.
8) After this you have to click on Forward Copy of Incoming Email Two. Click on Save Changes appearing below.
After following all the steps mentioned above, the emails of one account of your Gmail will automatically be forwarded to another Gmail account.