The Design Options tab lists options for under what circumstances prebills should be selected as well as options for when each component should be printed (with prebill, final bill or both). Some components also have the option to not print that component when there is no detail for that item.
This is also the location for the selection options. The user may elect whether the prebill should be selected when the matter or consolidation has A/R Activity, A/R Balance, No Details or Trust Balance.