Forerunner 55 and Oregon 700

I want to pair my forerunner with my oregon in such a way that my heartrate is visable in the oregon display and integrated in the activity (eg. hiking) in the connect app.

<span;>When I start the "walking app" on both my forerunner and my oregon, 2 separate activities appear in my connect app. I want it to be integrated.

<span;>What can I do? 

<span;>GS-ser