To set punch points:

• set the from and thru to the time range over which you wish to punch.
• press Alt+Shift+left square bracket; this toggles autopunch mode on.
• now press Alt+Shift+left square bracket twice; this sets the punch range to the from/thru selection.
• If you wish to read (verify) your punch points, press control+shift+left square bracket once for “punch from” and twice for “punch through”.

note: For this to work , make sure the Record toolbar is enabled.