Hi Vaibhav,
Before a user can use a website, a contact record must be created for that user. so all related records of the user related to the contact record, what you need is delete the contact and related records of the contact.
As you mentioned, “Let me know if anyone have some workflow steps or process steps which I have to use here”.
Unfortunately, workflow doesn’t provide any OOB steps to delete records.
There are three relationship between entities in crm, 1: N and N:1 and N:N, I guess your requirement is to delete all child records of the contact(contact and other entity is 1:N ).
In fact, Whether a child record is automatically deleted when the parent record is deleted depends on the relationship behavior.
As long as there are following configuration in relationship behavior will delete all the child records.
(1) parent behavior type and delete is cascade all.
(2) referential behavior type and delete is remove link.
(3)Configurable Cascading and delete is cascade all or remove link
For more details, you can refer following link:
Entity relationship behavior (Developer Guide for Dynamics 365 Customer Engagement (on-premises)) | Microsoft Docs
Regards,
Leah Ju
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