To avoid mapping elements one to one from a source to destination schemas one by one we can use the tip/trick of pressing the Shift Key and then dragging the link from the record node of source schema to the record node of destination schema. As soon as we drop the link the mapper will give us options to select link by structure, link by name and mass copy.
Some more BizTalk Mapper Keyboard Shortcuts are available on MSDN here. I often use the ones for search and indicative match.
|Fig. 1 BizTalk Mapper Tip/Trick.|