Reorganising some categories on a board, and whil the standard variables apply to most of them, there are a couple that do not. In order to maintain board cleanliness, the only current way to do this is to create multiple variables of the same thing and apply them to each individual category where they are needed.

A much more efficient way to do this in terms of time and ease to maintain, would be the option somewhere for assigning a variable to some, but not all, categories. Either on the variable page itself, having a "Categories..." or "Levels..." Option with a dropdown to select the levels you want the variable to apply to, or on the category/level edit page itself, show the variables in a tickbox list with the option to add and remove variables on a category by category/level by level basis.