Editing an SQL report: Response Group Usage Report - Lync Server -- 2

Hello! I need someone to teach me how to make minor modifications to an SQL report. The report I'm trying to modify is a Lync (aka Skype for Business) server report and it provides a detailed look at the number of phone calls received by all Response Group workflows, then breaks those calls down into more finite categories such as Offered calls, Answered calls, and Abandoned calls. More info can be found here: [login to view URL] The report currently retrieves stats for all incoming calls. I need the report modified so that it only looks at calls that came in during office hours. I have access to this report in rdl format which can be opened using MS SQL Server Report Builder. Your help would be much appreciated.