A limited company called Believe in Scotland Ltd was set up with a view to give more legal brand protection to Believe in Scotland. This company exists and can be found on the Companies House website. It is set as dormant for the moment as Believe in Scotland is currently part of Business for Scotland Ltd.
Had a referendum been agreed, Business for Scotland Ltd and Believe in Scotland Ltd would have been separated and operated as distinct campaigning entities. At the moment, Business for Scotland manages all Believe in Scotland activity as a wholly-owned campaigning brand and underwrites the costs of the campaign as Believe in Scotland cannot fund its activities without financial support for Business for Scotland Ltd.
Corporate Governance is provided by an eight-strong board of directors of Business for Scotland and an external accounting firm. However the Believe in Scotland campaign itself is managed by a National Campaign Steering Group who are a democratically elected group of representatives from Yes Groups across Scotland and ten representatives from National Yes Groups.
You can see a list of those affiliated local and national Yes Groups here.
You can see the members of the National Campaign Steering Group here.