Forms are typically used to submit content to a server, but the form you linked to doesn't submit any content.
I guess you are asking about how to populate the content area as users make selections from the fields at the top, and copying the results to the clipboard.
That's not really how Toolset forms are used (they are specifically for publishing—or editing—posts), so there is no particular reason to use a Toolset form to achieve this.
You could create a custom post type and add some fields to it, and then create a form to "publish" the posts and just discard the submissions.
In that case it would still be the case that you would need to add custom code to reproduce the functionality of the "form" you linked to, copying the field contents into the form body, and then—instead of submitting the form—when clicking the submit button copying the form body to the clipboard.
But it is very much a custom implementation. There is no particular reason to use Toolset for this, but if you wanted to you could consult the developers at https://toolset.com/contractors/, otherwise any developer familiar with JavaScript should be able to help you with this.
