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That specific type/level of customization is not available in GoldMine (at least at present). The fields available on the Opportunities tab of the Contact record are set as is. At most, you can change their left-to-right order AND rename them (via the Opportunity Manager Customize button), but those specific fields are all that can be displayed on that tab.
I presume a properly designed GM+View is always an option, but I have most traditionally known others to get to all the other Opportunity related fields simply via the Opportunity Manager itself.
Hope this feedback helps.