I am have two different feedstocks which are identified in seperate column (1 = feed crack / 0 = feed butad) by a name selection in column. How can you easily exclude one feedstock in an analysis without doing a 'hide and exclude'? I want to do a non linear fit (specialized modeling) and preferably not use the 'by'-functionality in the non linear fit for seperating the two feedstocks because I use this 'By' already for other purposes.