There have been some good blogs on the Portfolio Management being executed by Business Managers v/s Project managers.
Is "Product (or Service)" Management a logical extension for the Project Managers?
What are the channels and prerequisites for a Project Manager to transition to Product Manager, which can ultimately lead to a Portfolio Mgr. ------------------------- For reference: A very nice and relevant post from Andy - referring Portfolio Management transition: https://www.projectmanagement.com/articles...tion-PMO-Leader Saving Changes...
A role as a PM provides a good stepping stone to a number of possible career paths, one of those being into a pure business role such as a product or portfolio manager. A PM who has interest in such a transition should try to learn as much as possible about the company's products & services, demonstrate a strategic mindset in the recommendations he/she puts forward, and get some foundational education (assuming he/she doesn't already have it) in marketing, strategy and a few other disciplines.