The PhD program is three-year program consisting of two years of research and half a year of course participation. For research fellows (hired by CBS) the remaining six months will typically be spent teaching CBS students. For industrial PhD fellows (employed by the company or other organization) the remaining six months will typically be spent working in the organization by which the fellow is employed.

Read more about both possibilities here

Via this link you will also be able to find information about the possibility for becoming an independent PhD student, which implies no employment – and therefore, no salary from CBS. The PhD student is affiliated with CBS as a student only, and must pay a tuition fee.