[lcsper]

From what I understand your using Manual Tempo mode to tap tempo for the whole song, then when you want a new tempo you tap tempo again and everything shifts correct? If you want to have a new tempo without things shifting you will need to do the following:

For the tracks which you do not want the tempo to shift you will need to turn Elastic Audio OFF. To do that, go to the Edit window. On the left hand side where your tracks are displayed, expand the track size to medium by right clicking on the right hand edge of the tracks display. Then, right below the display selector (where you pick to display waveform, automation data, regions, playlists and so on) you will see two little boxes. On the left hand side you will see either a green metronome figure which represents that the track is measured in ticks or a blue circle representing the track is measure in samples. On the right hand side you will find the Elastic Audio box, which allows you to select the mode of operation of the Elastic Audio plugin. Click on this box and choose none. Now when you change the tempo, that track will not get streched.