Slicer that will select a column

I am pretty new to pivot tables and am struggling. I have a massive spreadsheet with assessment percentages in for 29 different subjects going across the columns. What can do is slice, by say gender, but i also want to slice by subject as well so that my tables will pre-populate

I don't want to have to create multiple copies of the "Art" sheet and then keep changing the subject

What am i missing?