Answer:
To comply with the Sales Manager's request that a user who selects a region must also select a zone,
set up the picklist dependency between the region and the zone.
Step-by-step explanation:
Setting up the picklist dependency depends on the creation of a module that has a source field and a target field. The target field (region) becomes the controlling field, while the source field (zone) becomes the checkbox field. This will ensure that the values picked for the target field (region) has valid values that depend on the value of the controlling field (zone).