Format currency amount using Indian numeral separator in MySQL

You are looking for Indian numeral separators (lakhs, crores). We can use Format() function, with third parameter set to en_IN (English - India) locale. Second parameter is set to 2 for specifying 2 decimal places after decimal point .. Finally, the CONCAT('Rs. ') adds the currency to the result.

select CONCAT('Rs. ', FORMAT(sum(netamount), 2, 'en_IN')) 
from syncbill

Demo

select format(100000,2,'en_IN');

| format(100000,2,'en_IN') |
| ------------------------ |
| 1,00,000.00              |

View on DB Fiddle

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Edit: However, as discussed further in comments, your MySQL server version is significantly old (5.1) and it does not support Format() function with Locale parameter. Check 5.1 documentation here.