@cacglo It looks like you are asking about commented rage. You can achieve this using CommentRangeStart and CommentRangeEnd nodes. Here a simple code that demonstrates how you can achieve this:
Document doc = new Document();
Comment newComment = new Comment(doc)
{
Author = "Alexey Noskoc",
Initial = "AN",
DateTime = DateTime.Now
};
newComment.SetText("This is my cool comment.");
Paragraph para = doc.FirstSection.Body.FirstParagraph;
para.AppendChild(new Run(doc, "Text before commented text. "));
para.AppendChild(new CommentRangeStart(doc, newComment.Id));
para.AppendChild(new Run(doc, "Commented text. "));
para.AppendChild(new CommentRangeEnd(doc, newComment.Id));
para.AppendChild(newComment);
para.AppendChild(new Run(doc, "Text after commented text. "));
doc.Save(@"C:\Temp\out.docx");
out.docx (7.7 KB)