Show on parent taxonomy listing listed in child

My problem is that i want to add listing in child only.. but if i do, those listing wont show up on map in the parent taxonomy.. so i want to add for exemple: listing in /tax1/tax2/tax3 i want to put listing in tax3 and make it appear on map if i go on /tax1/tax/2 and /tax1 Site: [login to view URL]