How do I seamlessly sync two fields between Contacts, Deals and Customer Cases?

How do I seamlessly sync two fields between Contacts, Deals and Customer Cases?

hey all,

say I have a custom field (the same one) on all three places - contacts, deals and customer cases.

how do I make it so that if I change the information in the field in say the Deal... this will change the same field on the Contact attached to that deal and the Customer Case attached to the deal?

thank you.