Update field based on another field's answer

Hello, I need help with:

I have a single selection field and I want to select one of the options from another field that is not visible, automatically, according to the selection of the single selection field, how do I do it?

"NOME DESTA OBRA-ATIVIDADE" >> "PEDIDO DE COMPRA"

Hi SEPTON_BR, 

Thanks for reaching out to Jotform Support. If I understood you correctly. Do you want to trigger an option from a single choice field based on the other field's option? You can achieve this using conditions. Let me show you an example:

1. In Form Builder, in the orange navigation bar at the top of the page, click on Settings.
2. Click on Conditions on the left of the page.
3. Now, click on Add a New Condition and then click on Update/Calculate Field.
4. Set the conditions as you see below:

Check out the result after applying the condition:

This can be applied to a hidden field also with no issues.

Give it a try and let us know if you are looking for something else.