Games are often presented using one ore more diagrams. One diagram contains some part of actual game or alternative sequence speculating what could have happened, if different move would have been played.
Typically each variation starts with new diagram definition. Without this moves in variation would not be included in export at all.
Multiple diagrams can be added using command File -> Print and Export wizard.
Use menu command Insert -> New Diagram to add one diagram at a time.
Diagram can be modified using Property button in property panel (left from diagram symbol in right hand side).
By default diagram includes whole board. Often it is desirable to include only part of board in diagram.
In order to modify diagram area, go to somewhere within diagram. After this select desired area on board and use command Edit -> Set Diagram Area.
Diagram can be deleted using Delete button in property panel (in right hand side).