Help to create a dynamic dropdown

Hi. Please I need your help to create specifics fields at the module of opportunities when you selected an option in a list dynamic dropdown.
it is the possible show me with pictures an example.

Thank your for your help.

Check this for some ideas:

https://suitecrm.com/suitecrm/forum/developer-help/16407-hide-unhide-field-and-label-based-on-dropdownlist-selection

https://suitecrm.com/suitecrm/forum/advanced-opensales-workflow-portal-support/7150-showing-form-based-on-drop-down-selection