I'm trying to define spools of this piping selection, when I select all the spool segments the all the piping sections are selected and it says there are pipe segments.

Now when I exit out and select the spool, the selection of pipe for 4 is not part of the spool.

Is there anything I can do to get that selection of pipe to become a part of that spool, I tried to to drag the component from the Route Parts folder to the Spool folder however that didn't work. Is there something I'm missing here?