Many of us have more than one bike. Maybe each bike has a different power meter, speed sensor, or cadence sensor. To avoid having to un-pair and re-pair your sensors constantly, we introduced the option of multiple bike profiles (see this article on how to avoid issues when pairing multiple sensors on one bike profile).
1. Once your phone and device are paired, go to your More tab.
2. Select GPS Settings.
3. Select Bike and Screen setup.
There you can either edit your current bike profile or add additional profiles. Once each bike profile is created, you can pair the sensors used on each bike. That can be sensors only used on that bike or, as in the case with heart rate, a sensor that's used with all the bikes.
Here's a video that goes through the process as well. Note that the video is now out of date and our devices no longer require a pairing code.