Sorry for my late response, I just came back from Mat Leave and trying to get back to my normal life.
#1: I tried copy and paste a table and it would carry the table style as well, this is a good trick. Thanks! But I was still wondering if we can export a table style for future use or to share within a group.
#2: I used datalink, I couldn't find a way to set formatting options in excel to make it work in AutoCAD, but if I manually edit the subscripted text in AutoCAD on each entity, it would work, but this is not a good solution for a large amount of data
Thanks a lot for your help!