To do this, first, download the template (e.g. a trade register application) that you want to include in the new template. Then open the template (e.g. a company foundation) that you want to merge with the other template in the edit mode. Create a new tab.
Open the OPTIONS. Now select the tab you have just created by clicking on it so that it is underlined.
Now scroll to this selection in the options and click on the underlined part:
You can now select a ZIP file in the file window that opens. The template is now uploaded to this tab together with the text, logic (i.e. rules) and questions. You can then edit the template (independently of your original template).