Thanks for clarifying. Yes, it sounds like they are three separate businesses so you did it correctly.
As I said before, it is ideal if you can 'link' it to the business with the highest profit. If the business profit is more than the total of column A of your 1095-A, in most cases the health insurance will be fully deductible; depending on how much Premium Tax Credit you qualify for, your business profit can often be much lower and you can still take the full health insurance deduction.
TurboTax does not allow you to apply it to more than one business.
