Sch C Taxpayer lives in CO and worked in CA for 9.5 months. How do I enter this so income is allocated?
Sch C T/P was CO resident living in CA 9.5 months. how do I enter so that the income is allocated between CA and CO?
Sch C T/P was CO resident living in CA 9.5 months. how do I enter so that the income is allocated between CA and CO?

Please review the many previously answered questions regarding how to handle this in Lacerte.
You have him as a full year CO resident. Then add CA as a state and report the CA schedule C income as CA income.