Need Help For Grouping the Rows

Question

Dear all,

I have a table like below

date                    bill_desc              amount

17-04-2017        RoomCharge        250.00

17-04-2017        BreakFast                80.00

17-04-2017        ExtraBed              120.00

17-04-2017       WaterBottle              30.00

Noe I want to sum the amount of Roomchage and description and display it as RoomCharge and remaining chrges are ther to be displayed.

date                       bill_desc                    amount

17-04-2017          RoomCharge           330.00 (RoomCharge + Breakfast)

17-04-2017          ExtraBed                  120.00

17-04-2017          WaterBottle              30.00

I need to group the data by date.. can anyone help me to acheive this. I have an idea that this will be acheived by case statement, But i dont know how to prepare that or you can suggest me the other method

Thank You in Advance