Zoho CRM - custom module - display values from lookup record

Zoho CRM - custom module - display values from lookup record

Hi Guys,

I'm looking for a quick tip what is the right and easiest way to solve my problem. 
Let me explain: 

1. I have created a custom module "ABC" in Zoho CRM
2. Module "ABC" has a look-up field where I select the related record (Contact)
3. The contact record obviously contains many data fields. some of which I want to be displayed in the custom module "ABC" when I make the selection in the look-up field.

What would be the easiest solution? 
Looking forward to any tips. 
Thanks.