Ok, I think I've duplicated your scenario—with the GB song Tempo at the default 120bpm, I imported an audio track, then overdubbed a new audio track against it.
The (relatively) new Logic "Smart Tempo" feature offers more comprehensive options for both approaches—what you see in GB is a (very) simplified version of that—but even there it can be confusing when you start to bring in outside audio and make changes in the middle of a project. I'm going to link this thread to a basic GarageBand course—maybe another GB user who's grappled with this kind of thing (with the very basic options in GB) will have some advice or suggestions. If you can clarify which approach you're trying to implement—changing the song Tempo or changing the speed (Tempo) of the audiofile—that would help me point you in the right direction. However, if the audiofile wasn't originally recored (& internally time-stamped) in GB, even this may require a somewhat kludgy workaround. Unfortunately, GB doesn't seem to offer any automatic beatmapping function, though it does offer Flexing to go the other way around—matching the speed of an audiofile to the existing Tempo of the GB song. IF you know the Tempo of the audiofile you want to match, and IF you can line up the first downbeat in that file to the downbeat in the GB song, then you might be able to successfully dial up the matching song Tempo by hand. (Also I'm not sure what you mean by "project's panel display"—are you referring to the GB Tempo track?)
When you say "adjust GB's project track bpm to imported song's tempo" it sounds like you're looking to change the Tempo of the GB song to match the Tempo of an imported audiofile? That would mean changing the song Tempo, but then you complain that "When I try to change the Tempo in the project's panel display, then the song's tempo also changes", which sounds like you *don't* want to change the song Tempo—there's my confusion. In this case, are you looking to match the GB song Tempo to the (internal) Tempo of a particular imported audiofile, or change the speed of that audiofile to match the existing GB song Tempo? There are two ways to "get the gridlines in alignment with song tempo"—change the Tempo of the song to match the Tempo of the audiofile (beat-mapping), or change the speed of the audio to match the existing song Tempo (time shifting—"Flexing" in GB/Logic). I'm not sure which of two approaches you're trying to implement.
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