How to use frames automatically generated Group pages (SimpleUI)

I have a Sitemap like this:

sitemap default label="My first sitemap"
    Frame label="Erdgeschoss" {
        Group item=Alwin_Zimmer icon="light"

So Alwin_Zimmer contains three items, and i want to group to of them in a frame. Can I do this without adding them all manually in the sitemap?