how to add an additionnal canal ?

Hi gbbi, 

Thank you for your post.

We are happy to hear that you are interested in adding channels to your TeamViewer licence!

However, since this community focuses on technical questions and ideas for new features, I would recommend you get in touch with our sales department -- either via email or by telephone, whichever you prefer. Our sales representatives will be able to tell you about the different options you have. They can also send you an offer or place an order for you directly. You will find all the necessary contact information on this site:

https://www.teamviewer.com/en/support/contact/

We look forward to hearing from you

All the best, 

Katharina