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I have 1 custom object with 10000 records, now i want to customize this object & I want to connect this object with 1 object with master detail relationship, so I have to 1st create lookup with that object & feel lookup field on child object with associated parent & then convert to master right??

So how to import that lookup field (Associated parent values) values with data loader?

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Yes, in order to have the field Master-Detail, the field must be populated for all records.

To import the associated parent values, you can either specify the 18 character record Id during an insert/update/upsert, or you can specify one of the parent's external Id fields during an upsert.

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