Fields custom

I would like to ask whether it is possible to configure certain fields for a specific supplier on the Classic page. Specifically, I am looking to understand if we can:

• Make a field mandatory for a specific supplier
• Show specific options in a field based on a specific supplier
• Set a default value in a field so the user didnt insert a value every time he enter the page

Please note that this requirement is for the Classic page.

If this is not feasible in Classic, please provide me if there is a way for redwood page but my priority for classic ?