Hi Roni,
MT4 can only support 100 Expert Advisors so MT4 will only support Ten of your portfolios. To run the 90 portfolios with 10 EAs in each one you would have to have 9 different MT4’s connected to the same account. I have had two MT4’s connected to the same account but not 9. I suppose you could connect 9 MT4’s to one account. You may need multiple demo accounts.
Alan,