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Prem ChauhanPrem Chauhan 

There is a List Button on  opportunityLineItem name as " GENERATE PDF " After Clicking on that button this Operation should be perform .. -->  generate PDF file for selected records through custom list button 

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Prem Chauhan,

How to generate PDF file for selected records May I Suggest you please refer the below link for reference. Hope it will be helpful.

Rahul Kumar