Week over Week for Performance Sales?

I am looking to create a dashboard for our 4 MAD parties, just to see where we were 2 weeks before each party for sales (we are currently 2 weeks before our 4th party and I want to see if ticket sales are on track compared to the other 3). 

I want a line graph where each line is a different one of those performances in that Production Season. So my "Break By" is Performance and my filter is "Production Season" just to get those 4. And my "Value" is Ticket Count.

The problem I'm running into is my X-Axis. I don't know what filter/formula to use since the week over week isn't by year. All 4 of these events are in the same fiscal year (October, December, February, March). How do I tell Tessitura "Give me sales by week for each of these 4 performances starting with the first on-sale date of each." And I want the lines layered on top of each other, so that day 1 of on-sale is day 1 for all 4, regardless of actual date...and so on and so on. 

Is that possible doing something canned, or do I have to start getting into the custom formulas? 

Parents Reply Children