And you also want to insert two duplicate MergeFields in the table.
But from your words, it seems that you want insert a table into the before-merged document. I am still not very sure about your objective exactly.
McLean Schofield Tag: Visual Studio Tools for Office Add a new menue item to Right click menu(VSTO SE) Office By dragging this component onto your worksheet, you will get the user control When you add a user control to your project and then build your project, a draggable user control component is added to the Toolbox, under the section " Components". What you want to do instead is to drag the user control from the Toolbox onto your worksheet. cs file's path and name added to the worksheet.
I am not clear with "dll accompanied by word". If yes, could you please clarify what are all the dll's needs to be registered. Is it possible to work with word document without installing it on webserver.