plotting moderation

#1
Hi,
I know that for most of you this will sound like a stupid question but I am teaching myself regression and I am quite new..
Does it make sense to plot slopes for moderation when pwerforming a multinomial regression? I mean, since I have a categorical dependent, what kind of meaning will the values on the Y axis have? In case the answer to the first is yes, can I use ModGraph?
Thanks a lot for your help