RadFlowDocument flowDocument = new RadFlowDocument();
            RadFlowDocumentEditor editor = new RadFlowDocumentEditor(flowDocument);
            Bookmark bookmark = new Bookmark(flowDocument, "Name");
            editor.InsertInline(bookmark.BookmarkRangeStart);

            Table table = editor.InsertTable(1, 2);
            TableCell cell1 = table.Rows[0].Cells[0];
            Paragraph cell_paragraph1 = cell1.Blocks.AddParagraph();
            editor.MoveToParagraphStart(cell_paragraph1);
            editor.InsertText("cell content 01");

            TableCell cell2 = table.Rows[0].Cells[1];
            Paragraph cell_paragraph2 = cell2.Blocks.AddParagraph();
            editor.MoveToParagraphStart(cell_paragraph2);
            editor.InsertText("cell content 02");

            editor.MoveToTableEnd(table);
            editor.InsertInline(bookmark.BookmarkRangeEnd); 

            RadFlowDocument newFlowDocument = new RadFlowDocument();
            RadFlowDocumentEditor editor02 = new RadFlowDocumentEditor(newFlowDocument);
            editor.InsertDocument(flowDocument);

            RadFlowDocument flowDocument = new RadFlowDocument();
            RadFlowDocumentEditor editor = new RadFlowDocumentEditor(flowDocument);
            //Bookmark bookmark = new Bookmark(flowDocument, "Name");
            //editor.InsertInline(bookmark.BookmarkRangeStart);

            editor.InsertBookmark("before");

            Table table = editor.InsertTable(1, 2);
            TableCell cell1 = table.Rows[0].Cells[0];
            Paragraph cell_paragraph1 = cell1.Blocks.AddParagraph();
            editor.MoveToParagraphStart(cell_paragraph1);
            editor.InsertText("cell content 01");

            TableCell cell2 = table.Rows[0].Cells[1];
            Paragraph cell_paragraph2 = cell2.Blocks.AddParagraph();
            editor.MoveToParagraphStart(cell_paragraph2);
            editor.InsertText("cell content 02");

            editor.MoveToTableEnd(table);

            editor.InsertBookmark("after");

            //editor.InsertInline(bookmark.BookmarkRangeEnd); 

            RadFlowDocument newFlowDocument = new RadFlowDocument();
            RadFlowDocumentEditor editor02 = new RadFlowDocumentEditor(newFlowDocument);
            editor.InsertDocument(flowDocument);

        static void Main(string[] args)
        {
                      Telerik.Windows.Documents.Flow.Model.RadFlowDocument templateDocument = GetDocument("Template.rtf");
            Telerik.Windows.Documents.Flow.Model.RadFlowDocument contentDocument = GetDocument("Content.rtf");
            InsertDocumentOptions options = new InsertDocumentOptions();
            options.ConflictingStylesResolutionMode = ConflictingStylesResolutionMode.RenameSourceStyle;
            options.InsertLastParagraphMarker = true;

            RadFlowDocumentEditor editor = new RadFlowDocumentEditor(templateDocument);
            editor.InsertDocument(contentDocument, options);

            string mergedDocumentFilePath ="MergeDocumentsWithWordsProcessing.rtf";
            File.Delete(mergedDocumentFilePath);
            WriteDocToFile(templateDocument, mergedDocumentFilePath);

        }
        private static Telerik.Windows.Documents.Flow.Model.RadFlowDocument GetDocument(string rtfFilePath)
        {
            Telerik.Windows.Documents.Flow.Model.RadFlowDocument document = null;
            var rtfImporter = new Telerik.Windows.Documents.Flow.FormatProviders.Rtf.RtfFormatProvider();
            using (Stream stream = File.OpenRead(rtfFilePath))
            {
                document = rtfImporter.Import(stream);
            }
            return document;
        }


        private static void WriteDocToFile(Telerik.Windows.Documents.Flow.Model.RadFlowDocument doc, string filename)
        {
            var rtfExporter = new Telerik.Windows.Documents.Flow.FormatProviders.Rtf.RtfFormatProvider();
            string rtfText = rtfExporter.Export(doc);
            File.WriteAllText(filename, rtfText);

            Process.Start(filename);
        }

            Telerik.Windows.Documents.Flow.Model.RadFlowDocument document;

            Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider docXprovider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();

            using (Stream input = File.OpenRead("PT1987 VU22888 Moodle Specification List [2024032716].docx"))
            {
                document = docXprovider.Import(input);
            }

            string normalStyleId = BuiltInStyleNames.NormalStyleId;
            Style normalStyle = document.StyleRepository.AddBuiltInStyle(normalStyleId);
            normalStyle.ParagraphProperties.SpacingAfter.LocalValue = 0;
            normalStyle.ParagraphProperties.LineSpacing.LocalValue = 1;

string rtf = File.ReadAllText("inputFile.rtf");
rtf = FixSelfReferringStyles(rtf);

Telerik.Windows.Documents.Flow.FormatProviders.Rtf.RtfFormatProvider provider = new Telerik.Windows.Documents.Flow.FormatProviders.Rtf.RtfFormatProvider(); 

 var document = provider.Import(rtf);

...

private static string FixSelfReferringStyles(string rtf)
{
    string regexString = @"{\\s([0-9]+)[^}]*\\slink([0-9]+)";

    var matches = Regex.Matches(rtf, regexString);
    foreach (Match match in matches)
    {
        if (match.Groups[1].Value == match.Groups[2].Value)
        {
            var oldValue = match.Groups[0].Value;
            var newValue = oldValue.Replace(@" \slink" + match.Groups[1].Value, string.Empty);
            rtf = rtf.Replace(oldValue, newValue);
        }
    }

    return rtf;
}