If you use the Voyager Lemmy app, it has the functionality to migrate Reddit subs to Lemmy communities. It'll do a search and give suggestions of what to follow. Not every sub from Reddit is on Lemmy, but a bunch of the more popular ones are.
Here's how it's done. You just add a +, then the other subreddit. Now your view has 2 subreddits.
If you use the Voyager Lemmy app, it has the functionality to migrate Reddit subs to Lemmy communities. It'll do a search and give suggestions of what to follow. Not every sub from Reddit is on Lemmy, but a bunch of the more popular ones are.