I kept my original question clear and concise to make it easier to answer. This is a response to requests for more information.
Introduction I am using QGIS version 2.18.9. I created about 20 new memory layers by clicking on "Layer", then "Create Layer", then "New Memory Layer". I want to create 8 duplicates of each layer.
Aim I want to avoid creating from scratch multiple layers containing identically-shaped polygons. I want to create duplicates so I can simply change the colour of each polygon to represent different data.
Problems When I right click on a layer and then click "Duplicate" I get an error message saying "Memory Layer type unsupported"
What I have tried As above. I have not found anything else on the program that looks promising. I have not found any topics on here that help. My knowledge is limited and I am not familiar with all the jargon or protocols.