Allow us to filter by Capacity fields like "Week Start"

We would like to see our work estimates by other fields not captured in the standard capacity report by creating a custom report. We are using the field "Week start" to show the estimates by month and those additional fields. However, we don't want to see all months - just months in a given year. But it won't let us filter by that column. If we filter by start date or end date, that won't work because some of our features begin in one year and end in another.