Opportunities Discovery tool shows all possible retrofit opportunities to discover in a tabular format for easier comparison. Already discovered opportunities have calculations for Payback, Investment, Emission Reduction, and Risk Rating. The ones that can be discovered are grayed out. By checking/unchecking the boxes in front of each row you can selectively discover/rediscover opportunities.
Depending on if you access the Opportunites Discovery from Buildings Overview page or Building Details page, you get Opportunity Discovery tool for all buildings, or for a particular building respectfuly.