A. {SENIOR LIVING} Yes you can edit an opportunity.  Inside the opportunity box you’ll notice the edit link. This allows to edit the opportunity date as well as include or exclude those related parties.  Excluding a related contact means the status of the related party will not be included in the opportunity for the contact record you are on.  Example:   Mary and Joyce are sisters.  Each of them is considering your/your location as an option.  If in this case either if each will be independently making their own chose and it is not depended upon the other, excluding them (in the opportunity box) would count them both as prospects, thus two opportunities.

Keeping them as included in the case above would count as one opportunity with two prospects.  In many cases it is an all or none for both prospects and in that case one opportunity.