How do you change tempo map or what process should i take working with tempo changes?

HI, so i learnt how to drag audio up to timeline to create a tempo map that follows the audio, it speeds up and slows down, next step, i figure out the best click tempos and at which points the song should change.......but how do i attack this......i go into project and i change tempo to 120bpm for example at bar 1, however it only stays 120bpm until the next change of tempo, so how do i wipe the slate clean and have tempo 120 from 0.0.0 to 0.20.00 and then 80bpm from 0.21.00 etc.......just a little confused about the best process.......i learnt about this cause i posted that i had trouble figuring out click tempos, im a guitarist mainly

Thanx alberto, but pressing alt+shift+5......orAlt+shift+S..it didnt open the tempo map window, it did nothing for me, i tried it a few times..still didnt work

Ok got that, thanx......so im drawing freehand with the pen tool, how do i draw a straight line...or make a section of the song all 120bpm (for xample)?

Hello - What I do in Tempo View is to set the snap setting to eights or sixteenths. Then just click where I want to change tempos. It stays in a straight line until I change it. The reason for the snap is so when I want to edit a tempo, it edits at the exact place every time. You can also draw lines & patterns, but generally I do it as I described. Hope this helps.

But yeah, once you do this, it usually ceates a thousand tempo changes (120.3, 122,119etc)......So i guess i could just make note of the changes and undo the tempo map? 
 

And like, i went into project set new tempo, and it only changed it for like one bar, and then goes back to the tempo it was afterwards
 

here goes my advise in a nut shell...
 
Break the parts of the song up in to sections.
Hook, Verse, Bridge, Chorus and so on..
Then listen to each section and use the tap tempo button in project/insert tempo.
once you have determined all the different tempo changes write them all down.
 
Start a new project and use the insert new tempo feature. (this of course includes mapping out the beats of your song.)
trying to match a tempo to a pre recorded riff can cause a lot of issues especially with tempo drifting.
everything and I mean everything, every little riff can be mapped and often should be to keep consistent musical time frame.
 

And yeah chuck, just tried both methods, dragging audio to timeline gave me an average tempo of 132bpm, which when i tried to play over it....nope......i began bashing head against the wall........then i tried tap tempo method, as you suggested, came u with 91bpm,.....and yes it feels right to play over.......So thanx for your priceless advidce once again

I think if you are having the project follow the detected tempo, that any time those detected tempos change, it will overwrite anything you had set up prior to that, so if you are going to use your own tempos, make sure other tempo changes aren't then coming along after and making additional tempo changes that you no longer want.
 
I usually do my own tempos - though if trying to match project to detected tempo it could get pretty weird (like what you seem to be going through).  But the way I look at it, if I am matching up to an imported track's tempo, then I don't know why I would then want to insert additional tempo changes of my own within the other tempos.
 
Bob Bone