In order to insert a table in a bookmark, you can create a DocumentFragment from the table and insert it in the manner demonstrated in the documentation
. For this purpose you'd have to build a RadDocument from code that contains a table, build the document fragment
and use the InsertFragment(
Please note that Table cannot be the first or last block in a RadDocument and you'd have to add empty paragraphs prior and after the table as done here
I hope this helps!