Hi,  I have a custom field on 'Contact' module. 

It is to allow me to track the lead source (Google Ads, Facebook Ads etc)

When I create a company, it is a 'required' field, but then when I create a new contact within the company this field stays blank. 

I need it to automatically copy the original lead source to all existing and future contact within that company.  

This will help me more accurately track ad spend and ROI.