You can see schematic drawing of fixed bulkhead (it is at the bottom of the window), wet-cast segment and either match-cast segment or floating bulkhead depending whether you wet-cast segment is typical or starting.

When you are satisfied with the results you can get to the next step by pressing 'next' arrow (please note, that you cannot go back), or you can press 'previous' arrow (or Esc) and return to previous dialog and be able to change the measured values.