Add the amount of each bill in this column. For example if you have a bill paid every month at 50.00 per month, add 50.00 in the Amount column. For bills that have variable amounts for each bill such as utility bills, take an average for that bill and add the average amount in this column.
For example, your mobile phone bill changes each month, take the average amount you paid each month for the previous year and insert this average amount in the Amount column.
Remember you can change this amount later so you can just add your best guess if you don’t wish to check your last 12 months bills.