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"How to set the Property of Custom field as ExternalId."

Hi,
 
Please suggest "How to set the Property of Custom field as ExternalId."
 
Thanks..
RiptideRiptide
Just go to the field in Setup -> Customize and click on the Edit link to edit the field.  There is a checkbox that says "Set this field as the unique record identifier from an external system".  Check that box and save the field.