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   Allows to define a computed variable and associate it to one of the
   defined groupings. This variable can be used to contain the summary values
   relative to the data contained in the grouping used.

   By pressing the Var button, a window is opened in which all the
   computed variables defined for the Report object are displayed. It is
   possible to insert a new variable by using the Ins key, while the
   Space Bar and Del keys will respectively let you modify and delete
   the already defined variables.

   Each comupted variable is associated to a group. During the definition of
   a variable you must first decide which file it will be associated to and
   the group of the selected file that the variable will be part of. In both
   cases, the choice is made by simply selecting the desired element in the
   given list.