In addition, the broker will provide supervision to his/her team, pay commissions and assure no unlicensed person is performing a licensed activity.I own a property management company in Ohio.  

You have to target quality, lasting builds in the better sections of these neighborhoods, you have to renovate cheaply and well (in my case by doing it myself or running supervised crews), you have to have your money resources and reserves in lockstep order, and you have to learn how to vet and manage these tenants.

But to engage in license related activities you need a license.An exemption would be if you were an employee of a company retained to run an apartment building and the employees were under direct control and supervision of a broker.

And is there any language about charges added to the cost of the repair to cover the PM's time for supervising the process of getting bids and then overseeing the actual repair to be sure that it is done correctly. 

or was one simply supervising? 

I let her know I have eight years experience as HOA president, I told her how involved I was in the day to day operations of the HOA, and how I supervised the replacement of all the vital components including pool gate, pool motor, patch and seal drive way, repainting if all the building exterior, letters, rules, notices, irrigation, landscaping, etc.

Here, I want to delegate this job to a contractor to supervise, pay, manage subcontractors but I'm having trouble coming up with a fee.  

Yes, you have to work under a Broker that can supervise you for a certain period of time, usually 2-3 years.

They in turn found the GC for us through their own connections, handled all negotiations, and supervised the work, all for a 20% mark-up.

If you are somewhat desperate in your search maybe you could let them do some repairs but only 1 project at a time and with your direct supervision and approval?