Calculating Across Tables
From LibreOffice Help
You can perform calculations that span across more than one table in a text document.
- Open a text document, insert two tables, and type numbers in a few cells in both tables.
- Place your cursor in an empty cell in one of the tables.
- Press F2.
- In the Formula Bar, enter the function that you want to perform, for example,
- Click in a cell containing a number, press the plus sign (+), and then click in a different cell containing a number.
- Press Enter.