You can add a shared Wave to a survey campaign
Steps
Go to the Survey Campaign page.
If you don’t know how to do that, read Access a Survey Campaign
Select More Options and in the dropdown menu that appears: choose Waves and Settings
You arrive on the Survey Campaign’s Settings page
Scroll down to the Enable waves section
Select Shared
The survey’s Shared Waves will appear
Press Save
That’s it. Now you can select this wave when collecting survey responses whether via
A unique survey link sent to a contact
A unique 360° survey link sent to a contact’s observer
A survey completed by a signed-in-user