How to add HubSpot Custom Properties

[@eddiehughes8077]

Thank you! Perfect video.

[@kateloumccabe]

Love your videos. So helpful

[@DanielMaco-d5k]

thanks for the helpful video.How would I make the property be able (or required) to be populated by an existing contact? e.g. let's say I wanted to create a CONTACT property called "introduced by" and to fill that property, I would select from an existing contact. Thank you