Calc should display the sum of the selected fields now automatically. A dialog named Formula is displayed typing SUMLEFT in the formula text box. In the Formula box check the text between the.
Double-click on SUM to add the function to the field.
If the cell you selected is at the right end of a row of numbers Word proposes the formula SUM LEFT. If you want to sum a row of a table in a Word document do as follow. If the cell you selected is at the right end of a row of numbers Word proposes the formula SUM LEFT. Calc should display the sum of the selected fields now automatically.