Hi Ayesha,
do you need to show only for some field or all field number in idempiere?
there are several methods to achieve this. for simple method, you can put "#,##,##0.00" on "format pattern" field on the column or report field.
the other method is set the base language as India and set language iso code to "en_IN", it will affect all number formatting based on it.
Regards,
A. Zuhri Utama
RekaEstuDigital