I have exhausted my search efforts. Here is the background:

List 1 name: lstOpCard
List 2 name: lstPassdown
button name: Move

I want the user to make their selections in List 1, click a button, and have the selections made in list 1 transfer to list 2. If there is already information in list 2, I do not want the new selections in list 1 to replace what is already in list 2. I would like it to supplement what is already in list 2.

I currently have a button that will produce the values selected in the first box into a string (separated by commas). The string is called sTemp.

Any help would be greatly appreciated!

Thank you