Problem with editing python (separate items on trade).

Hi guys. Ok, I want edit file uiexchange or uiinvetory from file root in pack. I want edit this or that file, becase I want can separate items on handel.

Hmmm.. watch this video what I mean:

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If you see separate items on handel is blocked, but when who edit uiexchange or uiinvetory when do this :D.

Player who are trading with me e.g. are see 200 potions, but I separate potions and he get 1 potion . You understand xD ? Because I'm not soo good in englisch . Please help me .

This is the 2 files:

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Scan [Only registered and activated users can see links. Click Here To Register...]

I don't know what I must edit in this files to be this efect, I can't python :D. If you can do this, pls help me ;(.

Before trade, seperate them dumbass.

You can edit anything on client side, but server side will be different.

Good dammnit ;/, I know before trade I can seperate, but I want edit to be separate on handel...

Hmmm.. ok. Maybe can delete phrase of checking quantity items ?

Point?

Maybe in files from root can do this ?