A Smart Group as shown in the capture works
kind:tag name:apple OR pizza OR chocolate OR pear
However if you want to create a lot of such “Subset” Smart Groups it might be easier to use Script: Add reference URL to aliases and create Smart Group.
With the script the steps to create a “Subset” Smart Rule are:
- select tags
- run script
- move resulting Smart Group from the global inbox into the tags’ database
- rename Smart Group
The script uses the selected records’ (in your case: tags) reference URL
and adds it to its aliases
. This way we can create subsets of a database (and add more search criteria manually if necessary).