You can register all the companies you represent into the Visma Sign service and change roles between them. By changing your role in the Visma Sign online service in the “role menu” in the top right-hand corner, you can specify the company you are operating with. You can use the same user ID to manage all companies, but each company will have its own archive, settings etc. 

Each company must be registered separately at https://sign.visma.net/en/register. In case of companies within the same group, you can ask for a consolidated invoice from support.sign@visma.com.