Is it possible to create the Master – Detail Relationship field for the child object which is having existing records? : salesforce objects & fields
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Answer / Dhirendra Kuamr
Yes, it is possible. If a child record already exists and you want to establish a master-detail relationship with its parent, you can do so by creating the lookup field on the parent object first, then updating each child record to populate that field. After that, create a new custom field of type 'Master-Detail' on the child object, and the system will automatically create the necessary relationships.
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