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Praveen JhaPraveen Jha 

The ability for users to add cc's to cases-Urgent

Users should be able to add cc's to cases when they create them and to add/delete cc's during the case's life. Add one cc's field which data type is email on case object. When user add new comments on case  it's  automatically copied to cc's
Sumitkumar_ShingaviSumitkumar_Shingavi
You need to write a trigger on CaseComment object when a new CaseComment is added. So, you will look at Case.CC__c and fire a mail to that address from Apex. You can definately use Email Template to send email from Apex to keep it flexible.