Can you please help me how to add the Partner Information in Custom report type?
You can have the Partner Information only on Standard or Custom Report Types created for Opportunity or Account. Partners by definition are:
Partners are the companies with which you collaborate to close your sales deals. For each opportunity or account you create, the Partners related list allows you to store information about your partners and the roles they play in the opportunity or account.
Because you cannot create a relationship on the Partner object itself to any of the custom object (or any other standard object), you will not have the object available as selection while creating the custom report type (anything other than Opportunity or Account).