State tax filing

Complete the NY nonresident return first, before you prepare your CA resident tax return.   And make sure you set up your nonresident information in the personal info section correctly.   See How do I prepare a nonresident return.   

When you prepare the NY nonresident, you will come to a screen titled New York Allocation, where you will be asked if all of your income was earned in NY.   Answer NO here. 

After answering No to the question above, the following screens will ask you to allocate the income that belongs to NY state.