There are various methods to selecting multiple rows of tables within optiSLang:
- Highlight a row in the table you want to select by clicking on it. Press and hold the Shift key, then click another row. All the rows in between are selected. 
- Highlight a row in the table you want to select by clicking on it. Press and hold the left mouse button and drag the mouse over other table rows to select them. 
- Press and hold the Ctrl key, then click each row individually to select it.