Join campaigns

Hi

We moved a campaign from one site to this site https://neitilfyrverkeri.no/ a while back, and it worked fine after some adjustments. This is a campaign where multiple organizations are working together to change the rules and working with politicians, and many of these organizations have their own campaigns with signatures.

So our question is as follows: Is It possible to join these campaigns in to the page https://neitilfyrverkeri.no/ and SpeakOut petitions somehow, by importing ex .csv lists or other lists?

The page I need help with: [log in to see the link]