Dynamic CRM 365 Copy/Clone child records from One Entity to another Entity
Briefly

To copy or clone child records in Dynamics 365 CRM, custom code is typically needed to automate this process, mapping all fields individually can be time-consuming and prone to errors.
A solution by MeghShyam Gaur involves removing the primary key of the retrieved associated record, setting the primary key value to Guid.NewGuid(), and removing the parent record ID.
Read at CodeProject
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