Hello,
Standard accounts supports multiple companies in one database (currently it is in beta stage). So you only pay once. So for eg. if you subscribe to integrated accounting is for all companies.
Currently multiple companies is beta, so you need to contact one of the partners, so they set up the companies.
Other option, 3 different installations for Standard accounts.
Partners can be found here:
http://www.hansaworld.com/en/partners2/overview
Best Regards,
Hansaworld support