How to ignore all destination members, except the ones that are mapped?

Is there a way to do this? We have a SummaryDto that maps from three different types, and when we create a map for each type, props that are not mapped are throwing an error. There are about 35 attributes on the summary dto. To use Ignore() option on each one is just too much trouble. Is there a global ignore? Something like

CreateMap<Source,Target>()
   .IgnoreAllUnmapped();