I have searched for an answer and it appears that an "add-in" is one (the
only?) solution:

Try:

http://www.dq.winsila.com/tips-trick...and-words.html

"Kamal Singh Oberh" wrote:

I am in India. And the usual method when working with 'money' figures we use
comma as the separator for thousands. Example of such separation is
76,54,321. However, all that I am able to do is in this format 7,654,321.
How do I default the settings for use in Indian way?