Just curious if can I autopopulate custom post fields (like checboxes or select items) based on another custom posts setup?

Good example is office locations as first custom posts, service areas as second and employees as third which can select multiple office locations from first custom posts setup and multiple service areas from second one.

Or maybe there is a better solution to tackle that problem like using categories of employees custom posts for service areas and tags (for custom posts) as office locations? My goal is to avoid redundancy and pull office locations and services from one centralized location.

Thanks