Like you said, California is a community property state. A spouse has control of his or her separate property and half of the community property. It is not clear to me what you are asking. Are you asking a spouse wants to give half of the separate property to the other spouse by adding the other spouse' name on the title?
The answer to your question largely depends on the character of this property.
Assuming that is the case. All you need to do is to add his or her name to the title and record it to county office. Whether this would change the property character depends how the title is written. For example, both of you can hold the property as hu*****and and wife as community property with right of survivorship. Or you can hold it as joint tenant with right of survivorship. There are many other ways to achieve this. The possibility is limitless. Gift is only one way.
To change the character, a transmutation is necessary. It must be in writing, signed by the party to be charged. You can change it again anytime, change it from separate property to community or vice versa.
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