Start by creating the table in Excel. Save it.
AutoCad Insert OLE Object
Create from file Browse (optional: link)
or
Start in AutoCad and Insert OLE Object
Create New MS Excel Worksheet

In AutoCad, double click the table to edit it.

Using AutoCad 2006 and Excel 2003

A sample of the 2nd method is at:
http://freefilehosting.net/download/3llb6