I have a 220 circuit (breaker box) for a SPA. Can I run a 110 circuit from the 220 input?

Do you have a neutral in that breaker box?

Wire colors are Red, Black, White and Ground.

Please explain how you intend to use this 120 VAC circuit. Also, are you removing the 240 VAC circuit for the Spa or tapping a 120 VAC circuit off it?

Thanks for the help, I found a unused 50amp circuit in main box. I will use that and leave existing 110 alone.