You really should have added the details from your post here. The port and multiple lines are easily selectable when you click on the 'Browse' option from the pulldown and use either Ctrl or Shift to select multiple lines.
If your terminal does not show up in the dropdown browse options, that means that this terminal cannot be accessed. In order to make sure that the right terminals show up on your drop down menu, you must make sure to wire a hardware reference to the respective VI that is taking your terminal names as an input.
Regards, Efrain G. National Instruments Visit http://www.ni.com/gettingstarted/ for step-by-step help in setting up your system.