Cumulative sales graph over time with dynamic gross potential horizontal line

Hello,

I have created a simple cumulative sales over time line graph with 'Order Date' on the X axis and a running sum of 'Total ticket paid amount' as the line. 

Because we dynamically price, our gross potential is always changing. I'd like to add a dynamic horizontal line to this graph which shows the current gross potential for the production. I assume that would be 'seat unsold value' plus 'ticket paid amount'. But because the x axis is 'order date' this obviously won't let me add a gross potential horizontal line because it's looking at each day.

Is there any way to produce such a line on this graph?

Thanks!

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