How do I create report with contacts and related account

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Regards

Hello Emmanuel, 

What you are looking for, is mentioned in detail in this section of the documentation.

https://support.sugarcrm.com/Documentation/Sugar_Versions/7.9/Pro/Application_Guide/Reports/#Related_Module_Filters

I hope this helps. 

Best Regards,

Rolustech Support
Email: support@rolustech.com
Website: www.rolustech.com