Hi MariaPatino1,
If you are looking to create a dependent dropdown lists and considering using Microsoft forms, this feature is not yet available. In Microsoft Forms you can only add branching i.e., it allows you to add a logic to a survey or quiz so that it changes according to the responses to specific questions. In a survey or quiz that branches, questions appear only if they are relevant to the respondent. If the questions don't apply, the respondent is redirected to a different set of questions or will skip a set of questions altogether.
Reference: Use branching logic in Microsoft Forms
Besides, if you want to create the list in Excel, please check the following links:
Create Dependent Drop Down Lists
How to Create a Dependent Drop-Down List in Microsoft Excel
***Third-party link disclaimer:***Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
Regards,
Neha