Your products have combinations and you'd like to use the combination attributes as product features?
This modification is ever so simple, as well as fast using Store Commander's CSV export and import tools!
Create a CSV export with the database fields id_product and the combination attributes you need to add as product features (color, size, etc).
Then, without having to modifiy the exported file (unless you want to modify some values), import the file, still with Store Commander, mapping the combination attribute fields with the feature fields.
In this example, the attributes Color and Size will be added as features onto the same product IDs.
The opposite is of course possible: export feature fields and map them with the attribute field to import.