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How can I set it so when someone registers it will give them multiple options to list under? I have CB installed and see how to set up a Tab-list but I need to ahve the tab have a list then then a list with the list.

Prime list option
              Select multiple items.
                                   Select multiple items.
                                                      Select multiple items.

For instance:

Plumber
      Plastic pipe
                 Underground
      Copper pipe
                 undergound
                 inside
                 large

just examples of kind of format would like to try and get.