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Saurabh Bisht 19Saurabh Bisht 19 

Using for Trigger design pattern and trigger wil be on Opportunity

when an Opportunity will be inserting an Opportunity Line Item should be insert by default with any of the Product associated with Opportunity.
AnkaiahAnkaiah (Salesforce Developers) 
Hi Saurabh,

Refer the below link have solution for similar kind of ask using flow.

https://automationchampion.com/2022/03/30/automatically-add-products-to-new-opportunity-2/

Thanks!!