Hi! There is a way to use tags, though it’s not fully implemented yet: https://www.beeminder.com/tags
Once you have some tags, you can group the goals by that tag by going to beeminder.com/username#tagname
Personally (i.e. this is not necessarily an Official Beeminder Endorsement), I actually use tags in combination with a third-party extension made by a user: My Beeminder browser extension
If you have that extension set up, you can just press the ‘f’ key on your keyboard and a little search pops up. You can put the name of the tag in there, and it’ll show your tagged goals… and then it’s easy to erase the search and put in another tag. I find that a bit more convenient than using the hashtag URLs.