Converting a Master-Detail relationship into a Lookup relationship involves changing the type of relationship between two objects.
Steps
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1.
open Home | Salesforce
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2.
Click gear icon and select Setup from dropdown and click Next
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3.
Click Object Manager
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4.
In Quick find box, type object name in which one wants to convert master-detail into lookup field and click Next
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5.
Click on the object
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6.
Click Fields & Relationships
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7.
Click on the master detail field which is to be converted and click Next
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8.
Click Show More
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9.
Click Edit
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10.
Click Change Field Type
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11.
Click Lookup Relationship
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12.
Click Next
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13.
Click Save