How to show unique values on a reference field

[Alon Grod]

I have the field 'site' type reference to u_sites table on the incident table. In u_sites table i have two columns:
1) site name (display = true)
2) site location

In this table i have multiple sites with the same name but with a difference location.

When the user search for a site from the incident table, he see the same site name multiple times, for example:
Alon
Alon
Alon

How can I make sure that he will only see unique names (Alon will appear only once even though each 'site name' has a different location)

[pratiksha5]

Try this : https://www.youtube.com/watch?v=-FFs0mIJM_Q

Please mark helpful if it helps. 

[Anurag Tripathi]

Check this thread, similar post is answered here.

Solved: How to display only unique values from the Referen... - ServiceNow Community