I'm trying to limit the availability of picklist options across the organization based on the selected values of other records..

I.e. we use a picklist to identify the time (8:15, 8:30, 8:45, etc.) in which we interact with a client. If a timeslot of 8:00 is selected for 'John', I no longer want that timeslot available to 'Tom'. 

Thanks for any help! 

I'm trying to limit the availability of picklist options across the organization based on the selected values of other records..

I.e. we use a picklist to identify the time (8:15, 8:30, 8:45, etc.) in which we interact with a client. If a timeslot of 8:00 is selected for 'John', I no longer want that timeslot available to 'Tom'. 

Thanks for any help!