1. Select the area of the cells that you need to change
2. Press Ctrl+1 using keybard
3. Go to Customes and type this code: [$-2000000]#,##0.00
4. This will give you comma seperate and 2 decimals

[$-2000000]#,##0.00 this will make numbers separated by comma and 2 decimal points.

[$-2000000]0 this will just convert the numbers to Arabic. No decimal and no commas.