Thanks very much to both of you. @karbock I've given your instructions a try for one single bookmark. I was able to accomplish what I want, thanks very much. That should be sufficient for me.
In case you're curious though, in my exercise, after I carried out the migration steps, I still had to carry out some manual steps before I could play the bookmark on COMPUTER-B. I'll describe below.
Issue: Note that on COMPUTER-A I have ~50 bookmarks created from different podcast episodes. After I copied one podcast episode and bookmarks.dat to COMPUTER-A, I then opened the Bookmarks tab in MusicBee on COMPUTER-B. There were ~50 rows, just as on COMPUTER-A--which is expected. But in every row, the value in the following columns was blank: Artist, Title, Album, Commen--only an exclamation point icon was displayed in the far left column . Those values are not blank in COMPUTER-A MusicBee. Luckily the values int he Start and End columns were displayed correctly, which allowed me to correlate a row to its correct podcast episode (
see screenshot here). This is expected for most, since currently, all rows except one correspond to bookmarks created from podcast episodes I have not yet migrated to COMPUTER-B. But this was also the case for the bookmark attached to the podcast episode I had already migrated to COMPUTER-B.
Resolution: To resolve this, using the Start/End values, I located the row containing my desired podcast, then double click it. MusicBee then said it could not locate the source file and asked me to locate it (
screenshot). Once I did that, the row then displayed all the missing column values. I could then double click the row to play tthe bookmark. Of note though, at that point, the values in the Start/End columns stopped displaying. When I re-started MusicBee, they returned.
I'm not telling you that as a demand that you fix it. I can and will move forward with the steps you've given me. I'm telling you about this issue because you sound like you might be a developer, or someone else interested in knowing about this behavior.
Thanks very much for the help from both of you.