[HayZee518]

any number of outlets can be switched. the downstream outlets are parallel wired to the switch loop. if this is a dedicated circuit, instead of using individual gfci receptacles I'd opt to use a gfci breaker to feed the whole loop. you can use a standard 120 feed to the switch. its output would go to the first outlet input then any outlets downstream of this would use a standard outlet wired to the parallel output of the first gfci.