Q1: You have to check your 2017 Form 1040. If you have either 1040A or 1040EZ, you didn't itemize. On Form 1040, check line 40. If you filed as single, and the amount is not exactly $6350, you itemized. If you filed Head of Household, and the amount is not exactly $9350, you itemized, and if you were Married Filing Joint, and the amount was not exactly $12,700, then you itemized.
Q2: That is exactly where you will input this information.
Q3: You are right. What you were inputting was not correct. You did not make an estimated payment at all if they were taking the CA tax out of your paycheck. That box should be blank.
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