Currently we can create new custom fields in the "opportunity object " vs just standard fields (contact object). However, when creating a new custom fields in opportunity object they are not showing in WF/Actions The idea is to make them as available for automation [Triggers and/or Actions] similar to the standard fields so we're able to build WF around - Example: Opportunity Custom Field = "DATE PICKER"= Build WF for upcoming reminder just like we would have done it un Standard Fields. I know the same can be done in "Contact/Standard" but the functionality of it is more powerful when used in the Opportunity Window (object) especial when tracking "Future Closing/Sale Date" for that particular "opportunity"