How to get a scholarship for PhD?
If you could find a department that is fairly close to your interests that has a lot of teaching assistants (TAs), that would be a great way to fund your studies.  I suspect Management is not such a department.  I wonder if Economics would have enough affinity?  Perhaps Economics would have a pretty good number of TA positions.

Another possibility might be to try to find a job that would pay for your schooling.  This might require a part-time school schedule, at least initially.