Ensure you’ve created a symbol description (Shortcut = C)
Using your mouse, zoom into the area containing your symbol
Click the “Select” button to turn on selection mode (Shortcut = S)
Using your mouse, left click & hold to drag a selection box over the symbol you’d like to select
Click the "Select" button again to turn selection mode off and enter navigation mode. (Shortcut = S)
Save your progress (Shortcut = A)
How to: Make multiple selections.