Events / Leads are defined in a many to many relationship. Hence there is an EVents subpanel under leads. Unfortunately the Leads subpanel under events is missing. Please explain why this is so and how to have the subpanel appear.
Here is a tutorial to add a subpanel using code, you would need to adapt that for a different module:
In general, documentation for SugarCRM version 6.5 applies quite well to SuiteCRM, though not completely.
With that article you can also more easily Google for other similar articles. I hope you it’s not too technical for you! 