In Salesforce, a master-detail relationship is a type of relationship between two objects where one object is the "master" and the other is the "detail." This relationship is used to connect objects in a parent-child or one-to-many relationship, and it has several implications for data modeling, security, and functionality.
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open Home | Salesforce
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Click gear icon and select setup from dropdown and click Next
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Click on Object Manager to navigate to objects in Salesforce
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Click Quick Find and type name of that object in which master-detail field should be created and click Next Note : Master-detail relation data-type will work with only custom object
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Click object
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Click Fields & Relationships
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Click New Custom Field
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Click Master-detail data type and click Next
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Click Next
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Select related object from dropdown and click Next
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Click Next
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Enter Field Label and provide a name and click on field name ( it will be taken automatically) and and click Next
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Click Next
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Click Next
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Click Next
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Click Next
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Click Save
