Fatjon, if I’m understanding you correctly, you are talking about a method for EQing the entire mix going to the monitors (wedges or IEMs).
I think what previous posters were talking about is how to EQ an individual input or channel differently for various mixes. For example, not how to add more bass to the drummer’s entire mix, but, instead, how to add more bass just to the snare drum in the drummer’s mix (again, without impacting the main LR FOH mix).