Cal. Penal Code § 490.3

Notwithstanding any other law, in any case involving one or more acts of theft or shoplifting, including, but not limited to, violations of Sections 459.5, 484, 488, and 490.2, the value of property or merchandise stolen may be aggregated into a single count or charge, with the sum of the value of all property or merchandise being the values considered in determining the degree of theft.