Showing traffic to a page as a % of traffic going to parent category
I'd like to show % traffic for a page as a % of overall traffic enjoyed by an other area of the site. I have been struggling to show this in Data Studio.
I have looked at creating new metrics, that didn't work. I am able to show traffic to both areas with a scorecard where I filter the page value field to look at the 2 values I'm interested in but I can't figure out a way of expressing this as a % instead.