How to conditionally set the values of a Dropdown Field?

i have 2 drop down options.

What i want is if something is selected in drop down A than drop down B should select something automatically.

like if i select Building x in drop down A Than the location should be automatically selected in the drop down B.

Is there any conditional formatting i can do to make this happen?

Sadly, you can't conditionally set the values of a dropdown field. Perhaps a widget might fit the bill. Please have a look at the Dynamic Dropdowns Widget and see if that will match your requirement.

Related guide: How-to-Add-a-Widget-to-your-Form