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How to do look up behaves as a master without changing the data type?

Best Answer chosen by sultan
PratikPratik (Salesforce Developers) 
Hi Sultan,

You can change the properties of lookup field to make them behave as Master in master detail (though not completely).

While creating the Lookup filed see the nscreenshot below:

User-added image

If your lookup field is already existing, make sure that evry lookup field is having value so you can change the field to Master detail.