SQL Transactional Replication - [Subscriber] How to transfer back data to production database

Hi SQL Technet Support

I have question regarding SQL Transactional Replication methodology


1. Let's say successfully created SQL Transactional Replication and running / transferring data from publisher to subscriber

2. Now one day the source production / publisher SQL Server is down and the remaining DR SQL Server is up (subscriber)

3. Next day, we fixed and bring up the production / publisher SQL Transactional Replication server,
then how can we sync back all existing data records from subscriber into publisher side ?

Regards
eMail - douglas.foong@mol.com

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douglas foong