Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
I also have multiple member numbers from one council that I would like to merge. I also moved from Heart of New England to Narragansett Council and I cannot figure out how to move my account to Narragansett.
@ChristineCarney log into my.scouting.org > click Menu top left > Click Manage Member ID > one of the BSA # will be there marked PRIMARY > then add the other MID (BSA #) - you want to make the one that is your unit registration PRIMARY > Then go to Scoutbook.com and log in using your my.scouting.org credentials - All training should merge to the one marked Primary