Have you ever wondered as to how to write amounts in lakhs and crores instead of millions and billions ie 10,00,00,000 format.
Its quite simple :
Right Click the cell you want to format >> format >> Number >> Click Custome (last item on the left hand side Menu).Now type one of the below syntax formats in the "Type:" Text box >> Click OK.
Without decimal : 99,99,99,999[>=10000000]#","##","##","###;[>=100000]#","##","###;#,###
With decimal : 99,99,99,999.00[>=10000000]#","##","##","##0.00;[>=100000]#","##","##0.00;#,##0.00
And now you get amounts in Indian currency format.