Hello,
In MS CRM 2011, there is just Potential Customer field, so I am assuming Parentcontactid is a custom relationship, and while creating relationship you can set if you want to see left navigation or not, so it may be that while creating relationship "Do
Not Display" option is selected. 
You can try to change it by opening relationship record, Select N:1 relationship under entity editor (Settings->Customizations->Customize the system->Components->Entities->Opportunity->N:1 Relationship) and search for relationship record
where primary entity is contact (make sure to match field name with your field name which is parentcontactid) and try to change Display option. Save and publish your changes.
Hope it will help you.
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