I would like to be able to import song tracks into photostory deluxe 2022.
You can! In Timeline view simply drag the file onto an otherwise empty track and place its beginning at the point in your show where you want it to play. This assumes you already have each song as a .wav (or possibly .mp3) file. If you do not have such files you really need to create them first, which is a whole-different ball game!
HOWEVER, VERY LARGE CAVEAT! If your completed slideshow is intended for any sort of "public" viewing, i.e., it is not for wholly personal use (including by members of your immediate family), to use pre-existing music tracks in this way is almost certainly technically illegal! (Just to be clear, "public viewing" includes sites like YouTube or similar, unless you can make your production completely and solely "privately" viewable.) Otherwise, you can be deemed to be breaching the copyright regulations and so, in the worst case scenario, be subject to claims for damages by the copyright holders. In the case of music tracks there are often at least two copyright holders whose rights you are breaching; the actual song-writers and/or publishers and the record company who released the actual recording.
OTOH, if you are using songs that are in the "Public Domain" or are otherwise copyright-free or royalty-free there should not be a problem for you. Unfortunately, however, actual songs in the Public Domain can be included on a recording (e.g., a CD) whose recording copyright is owned by the recording company!
. . . . songs that are in the "Public Domain" . . . .
A common misconception is that any song on the Internet is considered to be in th 'public domain' - this is false, unless specifically stated as Jeff has commented.
A good source of music the the Youtube Audio Library for content uploaded to Youtube and presumably other sites and personal use as I can find no restrictions on this.