Unique key assignments for each alt

[JHFDabit]

Greetings,
I have not been able to discover how to make this work and I am new to this addon.

I use nUI with more than one character in the same account. I would like to be able to assign different key binding to the same Bar position for each individual character? For example I have char A with bottom right bar #2 assigned to Alt J (Jewelry Crafting) - my other char B has Mining in that spot so I assigned Alt M to it.
When I came back to char A the bottom right bar #2 now has the assignment Alt M and when I press Alt M the Jewery Crafting dialogue opens. I was hoping the key assignments would be by character.

thank you,
JHFdabit