Hello Axelle,
The documentation regarding Stylesheets is located
here and explains how to import/export a stylesheet.
When it comes to creating a list, you can find the ListStyles documentation
here. As you can see, each list level has its text (represented by its LevelText property and the {0}{1} etc. strings in the UI). In your case what you need to do is specify the first level in the style to be without text and each level after it to not include the most-outer enumeration. Please check the following code snippet on how you can define such list.
After that you need to make sure all Heading titles in your document are associated with an instance of this list style. For this purpose you can create a DocumentList and specify the ParagraphProperties.ListId and ListLevel properties of each Heading style.
I hope this helps.
Regards,
Petya
Telerik
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