Fetch options for select field

I added two contacts for a supplier.In purchase order I have a select field “contact”.If select a supplier need to get supplier contacts as options for field contact in purchase order.How?

Please check it.

I need all contacts added for that supplier as options for purchase order contact select field.

Here right?

You should use the Overriding Link Query By Custom Script

Here when i select supplier I need that supplier whole contacts in supplier contacts options

Customization and logic are required.


How to get selected supplier contacts in purchase order through client script

You have to customize it in your own way by lifting the logic from the reference I gave you.