How to create a Master detail relationship on a object containing records

How to create a Master detail relationship on a object containing records?

[nayeemahmed]

i am still a toddler for Salesforce and trying to learn my baby steps. Thanks for your wonderful explanation.

[galibshaik]

Nice Explanation. Thanks for the Video

[JaimeBIDtravel]

Great explanation! I am just missing how to massively link records

This is good info... but what’s the solution when you have thousands of records in a custom object? It’s going to be a daunting task to link records using lookup one-by-one?

[gagansawhney]

Would like to know the reason as to why does the system does not allow to create Master detail relationship.

[shubhammaheshwari]

But i am able to create master detail relationship without lookup