A Zervant account can only be used to manage a single business entity. It is not possible to have one account for multiple companies.
We do offer the possibility to invoice with multiple tradenames in our Premium plans, but even in this case, there can be just one registration/tax number for the company.
If you have more than one business entity, i.e. more than one registration/tax number, you should create one Zervant account for each entity.
If you have more than one business entity, i.e. more than one registration/tax number, you should create one Zervant account for each entity.