Hello,

Regrettably, there is no path expression which would allow you to do this and neither a way to add multiple paths to a viewing web part. However, you can select those documents on a viewer web part with a custom WHERE condition. You can use the path expression "/%" to select the whole site and all it's documents and specify the WHERE condition as a couple of LIKE clauses, for example:

NodeAliasPath LIKE '%folderA%' OR NodeAliasPath LIKE '%folderB%' OR NodeAliasPath LIKE '%folderC%'

You can generate the WHERE condition also dynamically with a custom macro.

Best regards,
Boris Pocatko