In 2021, I sold stocks at a loss in California before moving to another state by end of 2021. I still own a rental property in California that generates $10000 in income

Your $3,000 Capital Loss Carryover will reduce your income on your Federal return, which in turn reduces your California income.

 

Here's How to Enter a Capital Loss Carryover. 

 

For California, here's instructions on How to Enter Gain/Loss Adjustments. 

 

Here's more info on Capital Loss Carryovers in California.