RadFlowDocument flowDocument;
using (Stream str = new FileStream("input.docx", FileMode.OpenOrCreate))
{
    MemoryStream ms = new MemoryStream();
    str.CopyTo(ms);
    ms.Seek(0, SeekOrigin.Begin);

    using (ZipArchive archive = ZipArchive.Update(ms, null))
    {
        var zipEntries = archive.Entries;

        // Skip glossary on importfor (int i = zipEntries.Count() - 1; i >= 0; i--)
        {
            var entry = zipEntries.ElementAt(i);
            string entryName = entry.FullName;
            if (Regex.IsMatch(entryName, @"\[trash\]"))
            {
                entry.Delete();
            }
        }
    }
}       

            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);