3 item questions

1) I have a shop that sells a bunch of items. 6 (or so) of those items are potions that I would like to be able to group in a submenu, the reason for this is that you first buy a "potion holder" then you can buy potions to put inside of it (im going to use a modified tome to add charges of the correct types) so how can i go about making that submenu?

2) Also how can I make a "bag" item that will automatically be able to have the potions put into it when the tome is bought?

3) also the bag needs an ability that mixes the potions together (basically a use/mix command) the player can click the potion and use it or he can click mix click another potion and then click mix/use again to add another potion to the mix or use the mixed potions (no item will be created). So my question is is there a way to get which items were targeted by the mix so that I could do a simple

if Potion1 was targeted then
call function potion1 effect
endif
if potion2...

that way I dont need a long list of abilities and can do with just mixing the various effects

I'm sorry, but I read through all of them three/four times and I couldn't understand questions 1 and 3(And 2 somewhat). Plus, judging that no one has said anything in reply to this for some time tells me that they don't really understand, either.

This is what I get out of it(Why make solutions when I don't really understand what you're asking?):

1) You want to make a submenu? That is kind of vague, to be honest. Do you mean sub-categories? Or do you mean that those "potion holders" hold one type of potions and you want that specific set of potions to go into a certain potion holder?

3) This one's just confusing. I think I'll just quote what I think it says...

Is that what I'm supposed to read? Or...?

for number 1 I mean a spellbook-like thing click the icon and you goto another spot that has all the potions for sale

for #2 basically how do I make a bag and how do I make items go into it

for 3 basically I need an ability in the bag that "links" potions together and when it is used on a point on the map it causes all the linked potions to be used on that location at the same time