I earned income in two different provinces but lived only in one. Should I just combine my income from both when filing?

In TurboTax, you just have to enter each T4 on its own page. After you enter the first one, it will give you the option to add another. TurboTax will put everything together.

Thank you! When it asks me to enter in another T4, do I get to choose the province? As the Quebec T4 will have different named categories from the Ontario one.

You can choose the province on each T4 slip. The T4 for Quebec should be more or less the same as those for other provinces, as it is a Federal Government slip. You may have gotten a Relevé 1, but TurboTax has the option of doing one of those as well.