I tried to get all portfolio specific to project as below but I can't filter only portfolio. I get features and Strategy.
I tried to filter using the two fields
1) PortfolioItemTypeName = Portfolio
2) _type = "PortfolioItem/Portfolio"
Please help me to get only PortfolioItem/Portfolio. I don't need "PortfolioItem/Feature" or "PortfolioItem/Strategy"