Creating Metadata

I found a video by Slosh on youtube where he shows you how to create metadata for Daz Studio. He uses the product Stylin' for M4. I have that product so the thought I would try to do what he did. I have watched the video several times, and taken notes, but I keep getting stuck in one part. You open the Content DB editor. You select the glasses. You set the type to follower/accessories/head. Under Categories, you select the glasses and right click and select "Add categorey to Selected Files". You are suppose to get a big list and from the list you are suppose to select "Default/Accessories/Head. But I don't get the big list. I just get a box where I am suppose to type. I just tried it again. I thought maybe there was a little icon that I was suppose to click on to get the list, but I can't find one. It doesn't seem good that you would have to just type it in. You could make a mistake. Plus you don't know what all the existing Types are. So what am I missing?
There already is a compatibility listed. /Default/Lost and Found/Stylin for M4. I thought maybe because it existed that that was the reason I didn't get the big list, so I finally deleted it. But still no big list when I follow the steps. So I just cancelled and didn't save my changes.
Comments
Within the Content DB Editor, you want to select "Add Root Categories to selected file(s)" and it will bring up a window where you can drill down to your desired category.
An alternative, which is what I do, is select a file or file(s) within the content folder, right click and select categorize. I find this method much clearer as you can see all of the categories on a large window. After I categorize, I then load the assets in Content DB Editor and add file type, compatibilities, etc...
Thanks, Lindsey. I'll try that.