I have two lists mainly TV Brand & There Models.


List 1 (TV Brand)
Sony
LG
Samsung


Depended List 2 (Models)
Sony LG Samsung
EX420 55EB9600 PL43E450A1FXZP
EX430 77EC9800 PL43E490B4FXZP
EX550 55EA8800 PL43E400U1FXZP
EX520 KN55S9C UN32EH5300FXZP
EX645 55EA9800 PL64E8000GFXZP

I'm using two Listboxes (Form Control) with multiple selection options namely Listbox 1 (Brand) & Listbox 2 (Models). I want listbox 2 input range to be depended on selection made on Listbox 1 (Brand). For example, if user selects Sony then box2 should show only Sony's models and if user selects Sony & LG, box2 should show models for both Sony & LG.