Label before the somatory in an interactive report

Hello,

               I made an interative report and in the last row there is a somatory of a column.

               I wanted to put a label before this column. How do I do that?

               Example:

                                      Employee     Salary

                                            X               3

                                            Y              2

                                                            5

                  In the row, before the somatory I would like to put the label "Total"

                  This:

                                       Employee     Salary 

                                            X               3

                                            Y              2

                                        Total              5