Here's a solution that should have you heading in the right direction ...
You have not mentioned the list name of your parent list or the code numbers in that parent list.
Let us assume the list name is BrandList which consists of 10 brands (1-10) and code 11 is "None of the above".
So applying the above assumptions, your Q3 constructed list will look like this ...
Note: I have also assumed you would like to randomise your brands. Remove the Randomize() instruction if I have assumed incorrectly.
And simply change your list name and the code numbers to your specific situation.