Moving a selection from a combo box to a list box

[Datathumper]

I have a little dilemna...

I would like to have a combo box (named isometrics) and then click a button to move that value over to a list box (named current isometrics). I would then like to be able to select another from the combo box and add it to the list box as well. OR, be able to filter on list box based on values that I type and then transfer them over to the other box. Thanks to help from BYTEMYZER on this prior issue, I was able to accomplish the move from list box to list box..but I would like to be able to filter based on a typed value, since the list box has alot of values and it takes a long time to find the value that I want.

THanks in advance.