If for each attribute in the attribute entry grid you list the attribute levels in the order you pre-assume (of preference), by setting the A Priori order to "Best to Worst" or "Worst to Best", then the same preference order will be assumed for all respondents during the ACA interview and during ACA/HB analysis. The same extreme levels will be shown for all respondents in the ACA Importance question.
You must be confident that each person truly believes that the levels you set A Priori are preferred in these levels. The adaptive interview and the utility estimation will assume this.
When you set an attribute to have Global, pre-assumed, a priori order, then the ACARATINGS questions are skipped for this attribute. The best and worst levels are moved forward to the ACAIMPORTANCE question.