You are being asked for the amount of income you earned while working in Arizona. That income is subject to Arizona income tax. As a California resident, all income, regardless of where earned, is taxable by California. You should
prepare your Arizona non-resident return before preparing your California resident return. California will give you a credit for tax paid to Arizona on your California return.
For more information on multi-state returns see the following TurboTax Help Artilce: