Federal and CA Amended Return

Can I file the Federal and CA-amended returns online? I bought a new car in 2023 placed in the business the next day, and used for more than 50% of my business. I used 200-DB MQ depreciation in my original return, can I change this depreciation to the Section 179 deduction for my new car?  I have a bigger tax liability in my original return, so I'm thinking of increasing the depreciation amount or changing the depreciation method in my amended return. Can I do that?