Manual entry T5008

My T5008 isn't in CRA to for auto-load, so I've got MANY lines of manual entry to do. For the field labelled 'Type of Income,' there's a dropdown to select either Capital Gains or Investment. How do I determine what to select for each transaction?

Also, there's this wording above the entry boxes: Note: Make sure you don't re-enter any of these amounts in the Capital Gains section.