SP Page Builder Pro allows you to use Page Builder mode also inside the description of SP Simple Portfolio items.

How to enable SP Simple Portfolio integration

1. Install or make sure that you have installed SP Simple Portfolio component.
2. Inside SP Page Builder choose the "Integration" tab.
3. Then click the "Activate" button in the SP Simple Portfolio box.
4. Till now you should be able to see and use the SPPB editor. 

How to use SPPB editor inside Portfolio

1. Go into SP Simple Portfolio (admin area) - Items
2. Now you should be able to see a button "Edit with SP Page Builder" inside each item (look at the below screenshot)
3. When you click on the button you would be redirected to the front-end, you should be logged in to be able to edit the Item description.
4. By default, there is no content inside the Item description. You start from scratch (empty page). Description added in SP Simple Portfolio (in a classic way) is not displayed there.  
5. You can use Rows, Columns, and all addons.

Description (Content) added by using SP Page Builder is displayed only inside a single item view, not inside view of all items.

 Edition of single Portfolio item description using SP Page Builder Pro