How to change the display name of the lookup field

Hello,

I am new to CRM and I am looking for an help to change the display name of the lookup field in related entity. By default the lookup shows the primary column field name, but instead I wanted the lookup to show other field name within the table. I have come across the below URL, but the given code doesn't seem to work.

https://learn.microsoft.com/en-us/archive/blogs/paf/how-to-display-related-entity-field-in-a-crm-lookup-instead-of-the-primary-entity-field 

Any help or suggestion is much appreciated.

Thanks,

Gowtham