Put a copy of the federal at the END of the California return. CA 540 instructions, scroll down to assembling your tax return
https://www.ftb.ca.gov/forms/2023/2023-540-booklet.html#Instructions-for-Form-540
Assemble your tax return in the order shown below.
Assemble your tax return in the following order: If required, enclose payment, but do not staple. Attach all forms W-2, W-2G, 1099, 592-B, and 593 to the lower front page of your form 540. Form 540 has six sides. Put the pages in numerical order and send all six sides to the FTB. After side six of form 540, put any supporting California forms or schedules you completed (for example Schedule CA, Schedule D, form 3514).
Behind the supporting forms or schedules, put a copy of your federal tax return and other state tax return if required.
Caution: Form 540 has six sides. When filing Form 540, you must send all six sides to the FTB.
