Complete the Oklahoma return first as it is the Nonresident state.
The Federal Adjusted Gross Income (AGI) will be adjusted using the Oklahoma adjustments, allowed in 68 Oklahoma Statutes (OS) Section 2358, to arrive at AGI from all sources. The AGI from all sources is used to determine the taxable income. After the taxable income is calculated, it is prorated using a percentage of the AGI from Oklahoma sources divided by the AGI from all sources. This prorated tax is the Oklahoma tax. See the Oklahoma nonresident return instructions for more information.
Where the California interview is asking for the Oklahoma AGI, it is looking for the figure that represents the percentage of the AGI that was taxed by Oklahoma. You may be able to get a credit on the California return for the tax paid to Oklahoma on Oklahoma-sourced income. The credit will offset the taxes paid to the other state, so you are not paying taxes twice. See this California FTB webpage for more information about the credit.
See also this TurboTax article and this one on multiple-state situations.
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