@billsspammail, and all,
Just did a little playing with Excel. If you know how to use Pivot Tables, it’s pretty easy to conform Sense exported daily data to whatever billing cycle you are on.
Select all your exported daily data (probably the years worth to date), then start a Pivot Table with the following field setup. Set the Name filter to just the ‘Total Usage’ checkbox.
Then filter the row labels using Between set to the range of your billing period. You’ll see all the days and the grand total.