@lahalahalhahhh There is no one formula for Line 23200 - it's just a total of all the deductions that don't have any other specific place to go to are put. If you look at the Other Deductions page, that has a lot of stuff that would go to Line 23200.
If there’s nothing there, look at the CRA page, see what is likely to apply to you, and then go to that page in TurboTax. If you are using TurboTax Online, click on the Tax Home page (2024 tax return on the left) to find whatever page you need to look at. You can either click on the links on the page or use the search bar at the top.
You can also get PDF archive of your return that will show you the actual forms & schedules that make up your return.
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