listbox and child entries?

Hi All, not sure if this is possible.

I have a listbox with lets say:

Burger
Wrap
Wrap
Burger

Now I also have "child" entries like

Burger
+tomato
-onion
Wrap
Wrap
Burger

now from what I can gather there is no child on a listbox so its all just another entry, the issue is if I remove the "parent" i need to be able to remove its children as well. in the above example if I wanted to remove the first burger the +tomato and - onion should dissapear with it, at this stage I would have to remove 3 items individually which can be frustrating.

any ideas on how I could do this or if the listbox does support children?

cheers