I do not see a way to do that.  You could force an amount for the extension. 

My question > Why would you want to do this? You can file federal now and wait to file CA later, if that is really the goal. 

Thanks for reply.

My goal is to send in a partial payment of CA tax due with tax return (via electronic withdrawal).  Client cannot make full payment of balance due.

I was able to override "full payment of balance due" for Federal tax due (Screen 3 Misc 1040 payment) but I could not find something similar for form 540...

I don't believe it is possible. Have the client sign up with CA at https://www.ftb.ca.gov/pay/bank-account/index.asp and start making payments there.