A quick guide to achieving this. It’s important to first understand that Roon has an idea of a “canonical” title of a work. This is the title you will see when you look at a Work Details Page which has a description of the work. It comes from Tivo/Rovi (viewable on Allmusic)
For identified albums:
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Make sure you have the best possible identification, preferably a Rovi one. If you have a non-Rovi identification you will not get the canonical title, then you will not get an automatic match. Telling which are Rovi identifications is a dark art, but one clue is that the composer will NOT be the Album Artist.
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If only non-Rovi identification exists, you will get a non-canonical work name. This will probably appear in the composer work list separately from any Rovi identifications. At this point you can sort the composer work list by name (or opus), and find the two works then MERGE them. (Highlight both, Merge button appears top right.) Then all will be well.
For unidentified albums:
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(The old way) Make sure you always use precisely the Work Titles from Allmusic.com. (These are the Roon canonical names, at least for all major works.) NOT necessarily those from the booklet as you mentioned above. If you use precisely the same Work Title, with the correct composer credit, the works will match up with other performances in your library. (Be careful of spaces and cases.)
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(The new way) Use any title but make sure the opus number is in there and correct. Roon now has an automated system which related works by opus number. It means with quite basic metadata you can get full matching automatically in Roon. It was a miracle when this feature was introduced. (It has problems if there are typos in the metadata sources, such as Bartók Concerto for Orchestra/Piano Concerto no. 3 which is confuses because of a typo somewhere.)
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(The lazy way) Use any title you want, and just merge it with the canonical one in the Composer Details work list.
One other thing: About the work descriptions you seen in Roon. If you don’t have an identified album in your library with the same work in it, you will not get this work description, even if you use the exact same work title string as in Allmusic. (It has been proposed that Roon should pull down this info for unidentified albums, but it is not yet there.) My work around (when I care enough) is to find a Tidal album with the work, add it, identify fully, maybe also merge works if necessary, then delete the Tidal album again. The association between the work (from an unidentified album) and the description text, remains after deleting the Tidal album. Kludgy but it works.
Disclaimer: Roon’s metadata system is evolving all the time. Things change. And nothing is quite what it seems. Metadata doesn’t necessarily entirely come from one source even if it looks like it does…
HTH