Conditional logic for dropdowns

Hello!

Well you could create different dropdowns and show the right one depending on a condition: https://sfmanual.rednao.com/documentation/conditional-logic/showhide-fields/

Another option is to use formulas, you could create a formula that conditionally filled the dropdown like this: https://sfmanual.rednao.com/documentation/calculatedfields/using-conditions-in-formulas/

Regards!