Updating the Excel table in the drawing

You have inserted an Excel sheet in your drawing from menu Annotate - Table - General

Without closing the drawing file, from Windows Explorer you open, edit the Excel file, close and save it.
In order to update the Excel sheet in the drawing with the changes you have applied without closing and reopening the drawing file, you just need to do the following.
Select the Table in the drawing browser or in the graphic window, right-click, Update.

Source: http://beinginventive.typepad.com/being-inventive/2012/02/updating-the-excel-table-in-the-drawing.html