Adding meta-data to loose files in DAZ Studio is quite easy, if you have a lot of them, and with proper categories included, it can become hard to find between two dozen tops and another two dozen pants just to find the result to form a matching outfit. This is the Products view of the My Stuff panel.
To generate meta-data for your product - or to create a continue-product from a set of artworks you want to group together - find a directory including some of the product's libraries in the Content Library tab, open the context menu herein, and select "Create a Product...". A small tab will pop-up, notify you for a name, and then "OK" to confirm. A new product directory then created in the related sub-folder in the "Products" directory.
P.S.: You need to select the content of the regular directory before product creation - I determinate it was not a must, but when I take a screen capture, the product directory was empty at the end.
