There is no built in feature for that, but you can build one easily by iterating over the products. Check out my book https://leanpub.com/epicommercerecipes/read_sample for example code of doing so

Hi Adam,

As Quan says, there's not really anything built in for that so it would require some development work. There is a CSV import feature however it can be quite fiddly to set up and there's no matching csv export feature which limits its usefulness. It's mainly aimed at manually loading in product data from external systems on an ad-hoc basis (where it wouldn't be worth an integration). There's also an import/export feature however it uses a zipped XML file format which wouldn't be much use for what you're describing.

I think the closest out-of-the-box tool to what you're looking for would be the batch update tool in commerce manager. Though it doesn't provide import/export capability, this tool allows you to select a field you're interested in for a given product type and update that field across a list of products at once.