I had 6 existing slicers connected to 4 pivot charts. I created a new pivot pie chart and want to connect 5 of the 6 existing slicers to it but I can't do so. The only thing I can do is create 5 new slicers which I don't want to do. 
As can be seen, there's no option to filter connections. I am doing a course on EdX "Introduction to data analysis using Excel" and this is a part of the lab exercises.