Line and stacked Colum chart - remove lines after filter

I ahve a visual of a data set, where the bar chart shows year on year sales for a total market. The line chart shows the slit of these sales, one is full price and the second is reduced price. All by month. 

There are a number of other visual showing different acpects of sales. 

i have been asked to put a button that toggles all of the sales between full and reduced price. When i do this i want the line on the chart to disapear, and it just goes flat. 

does anyone know how to do this?