Copy Lead Fields to Deal When Converted

Our SDRs do research on a prospect and gather information.  They updated fields on the Leads.  When a lead is qualified and it becomes a Deal, we want/need these fields to copy over to the Deal, but there doesn’t seem to be an option to do so.  Is there a way, like some sort of a mapping, to copy values from the Lead to the Deal when it is being created?  This would be greatly beneficial and prevent a bunch of copying and pasting from happening, or having to create some sort of work around to get it to work.