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1. In a new report or an existing one, create a custom calculated column. To do so, click on 'Custom columns' in the 'Columns' section. Once you've added all the columns you'd like to display on the report, check off the box next to 'Define a calculated column.'
In the expanded area of this section, set the field 'Type' to 'Checkbox.' Enter the following in the Formula box:
[Start Date] >= FirstDayOfWeek(Today()-Days(7)) and [Start Date] < (FirstDayOfWeek(Today()) - Days(2)) and
2. In the 'Filters' section, click on the right radio button to enable filtering. In the expanded section choose '<Custom Column>' from the "Select a field" drop-down list. Select "is" in the middle field, and enter the value "1" in the text box.