I have two tables consumos, con_dep. In the table con_dep I have one field name tag_con that it is string. With this field I wan`t to select 3 fields double in the table consumos, how name is "tag_con", "tag_con" + L and "tag_con" + T. How I can define the variable expression?: $F{$F{tag_con}} $F{$F{tag_con} + L} $F{$F{tag_con} + T} I need how defined the expression of the variable with it is a field that his name depends of another field