State tax filing

I'm sort of in the same situation but the answer should come from Turbo Tax because the steps used in the software changes every year.

I live in PA and work in DE. I've been filing for years in both states however this year Turbo Tax asks for the tax charged by each state. I can easily find DE on my W2 but not PA because PA was never deducted or estimated.

Why does Turbo tax (Fed +1 state) does it this progression. I've already filed in DE but I stuck with Turbo Tax doing my PA tax preparation. Also, how do I find the PA tax amount?