hello and good afternoon everybody. I would like to know if is possible record, stop the recording and later record again at the point that stop. something like punch in and punch out. thanks for your help and have a nice week. 
p.s. I have windows 7 home premium and audacity 2.0.5
If you want to “punch in” in the middle of an existing recording, you can’t do that in the same track. It’s a feature request.
From your description you may be satisfied with Append Record. Stop the recording. Then hold SHIFT and click on the Record button, or use the SHIFT + R shortcut. That will record at the end of the selected track or tracks.
Gale
hello Gale , good afternoon and thanks for your fast answer. I tried your advice and is exactly what I need but now I have to know how to fell in the right time of the song. maybe I have to use the " snap to " but the thing is that I don’t know how. could you tell me how to use it, please? thank you very much again and have a nice week.
I am not sure what you mean. Are you Append-recording at the end of the track? What are you recording, exactly? Is the new recording at the wrong speed compared to the previous recording?
Gale