Hey @aronson
Thank you for your question. Yes, you can merge artists rather easily in Roon. Here’s how you do it.
Select both Artists on the artist page.
Click Merge artists (in the top right corner of the Artists page)
Select the Primary artist. When merging artists you’ll want to set the primary artist as the one with Discography, artist bio, etc, in order for these metadata assets to appear.
For example; if you use the streaming service artist as primary, the local music files artist will be merged and metadata for streaming content will remain. If you use your local music files artist as primary the rich metadata links to discography, bios, albums reviews, etc will be lost.
You can unmerge artists at anytime by going to Setting>Library>Un-merge artist (unmerge button appears at the far right of the page)