This document discusses working with multiple sheets in StarOffice Calc spreadsheets. It notes that each spreadsheet can contain multiple sheets that are selected using tabs at the bottom. Sheets can be used independently, but can also reference data from other sheets to link them together. Formulas can sum values from cell ranges on different sheets, such as adding the values in cell A1 from Sheet 1 and Sheet 2. Sheets can also contain independent values, such as cells B4 and C4 containing different numbers on Sheet 1 versus Sheet 2.