Trying to export a BOUNCED SELECTION track and it exports as separate files. Why?

Hi guys

i am using two projects for the same song. one is for use to record vocals, so i dont get latency issues…

anyway i want to export the BOUNCED selection of many takes of vocal to do project with all the other tracks on,

using EXPORT - SELECTED TRACKS

However it copies are the individual parts, not the bounced selection, how do i export the BOUNCED selection?

Thanks a lot!!

With Export Mixdown.