Entity inside a Webform?
The webform module doesn't really provide such a feature without either using unstable dev version modules (and maybe achieving it) or custom code.

An easier alternative would be to use the Entityform module, which allows you to use any add-on modules that work with Drupal's field API.

This means you could achieve your requirement using something like the Field Collection or Inline Entity Form modules to provide a repeatable group of fields. In that case you can set the field to unlimited values and it will give the user the option to 'Add another item'.

With the Inline Entity Form option, you would have a separate entity for your ticket and you form will have an Entity reference field using the inline entity form widget, which will provide the full form, inline, whenever the user clicks the 'Add another' button.