How do I enter management and admin fees into Turbo tax self-employed online (line 8871 of T2125 Business Expense Form)? It is not a part of the asked questions.

Yes, you can still claim management and administration fees as an expense. In the expenses section of the Self-Employment part of the interview, there is a box called "How much did you pay for Banking and Other fees? You can put your management and administration fees there.