Cod2 zombie mod - Vote for difficulty

[Mariusz]

Hello, I have zombie mod and I would like to change vote difficulty by deleting easy, normal and hard diff and leave with impo and hell.
I wanted to change vote.menu on .iwd package but now I'm thinking about doing it with script files menus.gsc, bzmod.gsc or main.gsc.
Unfortunately, I'm not sure what to do.
My attachments from menus, bzmod main and vote.

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There must be some kind of missunderstanding. It's prbably my fault. Very sorry.
This time I attached screen from vote. I would like to delete Easy, Normal and Hard with those oval items on the left.
Really I do appraciate your help. My question is where and how do these change?