To hide an Advice Option or Advice Reason and thus remove it from the list of selectable  step go to customisation>advice options & reasons library. 

Select the section (e.g Investment Recommendation) containing the advice option or reason you wish to hide, then select the step (e.g Why Provider / Plan). The page will refresh and display all of the advice options / reasons for that step. Simply uncheck show for the advice option / reason that you no longer wish to appear in the section wizard for that step and hey presto that's done.

If you are an administrator of a multi-user company or group account this will also remove the advice option or reason from both the libraries and section wizards of your account users or any accounts linked to your group.