How do I input amount stated on T2200? The section in TurboTax to input this information is not straightforward

You don't enter what's on the T2200 Declaration of Conditions of Employment. Instead you would enter your employment expenses on a Form T777 - Statement of Employment Expenses to calculate your total expenses on your tax return. If you are using TurboTax Online, you can search for "employment expenses" to enter your T777 information.