Pick a single wire position or a range of wire positions (a range) from the list on the left. To pick a range, click on the first wire in the range, then hold the shift key down and click on the last wire in the range. You can also hold the control key to add specific wires to a range without selecting whole sections. Then, click on the ">>>" button between the lists to move that wire or wire range to the list on the right. To remove a wire or wire range from the left list, click on it and then on the "<<<" button between the lists.