I was wondering if it is possible to link a custom field within "Deals" and a field under "People". 

I am trying to set up our deals so that when our sales reps look at the details of a deal the customer's contact information is also visible along with all the other fields. I was wondering if I can set up a custom field that will automatically pull fields like "Name", "Phone", "Email". I know that I could always create another field under deals for that information, but I'm just being lazy and trying to enter the data in one place. Is this possible?

Thank you