Company Relationships records are only available from the Details tab's Relationships subtab on the Companies record.
Company Relationships Form 
Related Company
Name of the related company. This field links to the Companies service.
Relationship Type
Type of relationship that the two companies have. This field links to the Relationship Types service.
Start Date
Date that the companies entered into the relationship.
End Date
Date that the companies ceased their relationship.
Comments
The Comments field contains any additional details relevant to the Company Relationships record.
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