Hi Christian,
Thank you for your interest in Syncfusion Products.
You can replace a placeholder text by an image or table using the TextBodyPart class. Kindly refer the below online documentation link for more information.
Documentation link:
http://help.syncfusion.com/ug_94/Reporting/DocIO/Windows%20Forms/default.htm?turl=Documents%2F455replace.htmYou can also refer the online sample available in the below link:
http://asp.syncfusion.com/sfaspnetsamplebrowser/9.3.0.61/Web/DocIO.Web/Samples/4.0/Editing/ReplaceWithFormatting/CS/ReplaceWithFormatting.aspxRegarding your query about retrieving the section and paragraph of a TextSelection, you can make use of the WTextRange class to obtain the information.
We have created a sample to illustrate your requirement. Do find the sample in the below link and let us know if it was helpful.
Sample link:
http://www.syncfusion.com/downloads/Support/DirectTrac/85690/FindAndReplaceSample500999914.zipPlease let us know if you have any questions.
Regards,
Lakshmi Devi S