Cal. Prob. Code § 16608

(a) Subject to Section 16610, the terms of a trust may grant a power of direction to a trust director.
(b) Unless the terms of a trust provide otherwise, a trust director may exercise any further power appropriate to the exercise or nonexercise of a power of direction granted to the trust director pursuant to subdivision (a).
(c) Unless the terms of a trust provide otherwise, trust directors with joint powers shall act by majority decision.