As part of your onboarding, you will be asked to export your text templates ("Textbausteine"/"Textvorlagen") in a standard format (XLS, CSV) so they can be imported into your initial enneo installation.
After that, you can edit the templates in Settings -> Text templates.
In there, you can edit any templates and also leverage features of enneo, such as the dynamic variable selection that lets you use contract or ticket variables in a text template.
Enneo templating system
Enneo uses a templating system to dynamically assign ticket, contract, customer or custom client variables like addresses in templates.
It also allows if-then conditions or custom functions to manipulate dates for example.
You can find a full description with examples here:
Enneo template system