How to make interactive objects in Microsoft Word? (dropdown lists, checkboxes)

Question

As I stated in the title, I'm pretty sure there is some feature that can enable me to do that. Here is a document with an example but I don't know how it was implemented:

So how is that even possible ?

Note:

I am using Microsoft Word 2010 on Windows 10

Answer 1

How is that (displaying a drop down list) even possible?

Those drop down lists in your example are elements of a form:

To create a form in Word that others can fill out, start with a template or document and add content controls. Content controls include things like check boxes, text boxes, date pickers, and drop-down lists. If you’re familiar with databases, these content controls can even be linked to data.

Source: Create forms that users complete or print in Word - Office Support

Posting full instructions would take too much space for an answer, but you can find full tutorials at:

• Adding Form Fields to a MS Word Document - SmartWiki,
• How to Create a Fillable Form in Word | CustomGuide, and
• How to Create Fillable Forms in Microsoft Word.

These links should get you started.