The portfolio management is broken up into two different drop down options. Portfolio details and Bulk actions.
This article looks at portfolio details. You would use this method if you wanted to change Producer or Product details or you like to maintain your portfolio often but in less volume. In Bulk Actions you can make changes to many variants at the same time across many sales markets and add a new Brands.
Use the arrow's to open up your options - the actions you can perform here are:
The next article in this sequence is portfolio management with Bulk Actions.