Resetting instance indicators in assemblies

When I insert items in an assembly then delete them andre-insert them, the instance indicator (don't know if that's theright term) in the feature tree keeps on increasing by one...(ie.PartXXX<6>). How can I reset the count so if I only have 5 ofPartXXX in my assembly the count goes from 1 to 5, not 1,2,3,4,6

TIASolidworksAssemblies