Perhaps it is time to update. The latest version is 10. It has layers.
I don't have PhotoDirector 8 on my computer but check the Cyberlink KB for PhotoDirector 8. There are some Q&A there that indicate that layers are available. If you have an OEM, perhaps that feature has been eliminated. I'm not sure if layers is included in all levels of the commercial product. I know there was an "Essentials" level but I don't know what others were available.
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.