How to create trigger with autoselection?

[Peony]

Hi all.

I need to create trigger to select value in one field I choose value in the other field.

For example

I have field "Country" with values:

France,

Germany,

Italy

An the other field "City" with values:
Paris,

Marseille,

Berlin,

Hamburg,

München,

Köln,

Frankfurt am Main,

Roma,

Milano,

Napoli,

Torino

When I select France I need an auto-select France city that will be first in alphabetical order. So it will be Marseille
But also I need to have a possibility to make manually selection of the other city for selected country.

Please, can anyone help with this task?

[neelamsaroha157]

Do you want to select Just 1 city on the selection of Country?

If you want to select all possible then you can use field trigger -

[Peony · Accepted solution]

Hi Neelam.
Thank you for your advice. I want to select 1 city that would be first ASC for selected country.

Actually I already find the solution(in attachment).