Answer for How to duplicate portfolio section that can be accessed separately through the header menu?

I want to place the content in the portfolio tab (in WordPress Sidebar) for the duplicate portfolio section (i.e. projects) but I don’t know how the duplicate portfolio section will differentiate between the content of original portfolio section and the duplicate portfolio section. 
If I place something in the portfolio tab (in WordPress Sidebar), it automatically comes in the original portfolio section, can you tell how I can put content in the duplicate portfolio section.