Bi Viewer - Prior Time Totals

I have a daily report in bi viewer. This works by selecting the Week from a combo box and then it displays the days within that week (based on a sql table). I want to have the prior weeks show up as totals. Can't figure out how to do this within BI viewer or if I'll have to create a more defined sql query. Below are the screenshots from current setup. In this example I want to also see W1-4 but at their totals.

Select Week combo box: