When no Summed Price attribute is involved in the BYO, then respondents can just pick their preferred levels within each attribute irrespective of price premiums or discounts that might be associated. For attributes like brand and color, this makes sense. For "ordered" attributes where every respondent would agree regarding which level is preferred, we recommend you select the setting that drops those attributes from the BYO section. Thus, you are only asking the non-ordered attributes in the BYO section.
When an attribute is dropped from the BYO section, then ACBC's design strategy is to sample these levels with equal frequency for the subsequent "screener" section. For attributes included in the BYO section, ACBC's design strategy is to oversample the BYO-selected levels in the subsequent "screener" section.