Creating a User Form Template with Dynamic fields

Hi!

I need to build a form template using excel that a User can fill up in building an article for an online webpage.

Using the template, the User can select the types of fields applicable in building the form.

Perhaps we can think of it like selecting widgets in building an online webpage?

Basically it should look something like this:

Title: [XXX]
Summary: [XXX]
Body:
(For this portion, the user can select using different "tools" to build the body. Eg. To add a dropdown list / free text / radio button.)

Scenario: when the User wants to start building the body portion using dropdown, they can select a button saying dropdown and this will populate the field out for the user to fill up.

Sorry if this is confusing, but hopefully someone has a clue on this!

Thanks!