If I worked in 2 states and one doesn't have state sales tax how and where do I enter this?

I'm still not making myself clear. I'm in Turbo Tax. It's going to figure out my state taxes based on my total amount earned. There is no place to indicate that 1/3 of what I earned was in Texas. Since I can't enter that fact anywhere, Turbo Tax goes ahead and figures out my Maryland taxes based on my TOTAL amount earned. It's frustrating because on the page where it askes if I worked in another state, I say yes and there's a pull down menu but Texas isn't on the pulldown menu since there are no state taxes. But I need to make clear that all of my income should not be used to figure out my Maryland State taxes. I have not found any place in Turbo Tax to enter this.