I'm afraid it's not currently possible. You can edit file's tags (e.g. Artist) to include identifier, this will make those files belong to a specified file type.
Maybe in future versions we'll add this feature, to identify files based on location, thank you for the suggestion.
Until then you can use Music Library from Tools, add the folder which contain all promo files, select all then choose Track Properties... After that click on File Type and choose the identifier Promo (which you made it before).
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