I have a parameter that shows 25 or 50 or 75 percentile. I am using it in my histogram calculations. The user want multi select while parameters only allow single select. Any workarounds for this?

I have three metrics A,B,C and I gave user dropdown to select a metric out of these. I have calendar day bins on x axis and selected metric values on y axis. Now my goal is to see average metric value for each calendar bin. but here I want to only see average of all values that fall in the percentile filter. and the filter is 25, 50 and 75 percentile. Now here I want to give user option to select not only 25,50 and 75 percentile but also 25 and 50, 50 and 75 etc (all combinations). Now, when I select 25 and 50 I should see two points in that calendar bin. and like wise for all calendar bins and a line shall connect these dots. so if i select two percentiles, i get two line graphs, all three percentiles, three line graphs and if only one, one line graph. how can i build such a visual in tableau? 

Note the percentiles here are for entire data distribution.