One way to work with simulation panels is to group them. With groups, you can group the simulation into simulation parts and later when applying the texture, it will use the group.
To group different panels you must select the panel and click on it with the right button of the mouse. A small window will unfold, where you can assign that panel to a group. We start with the first panel, which is the t-shirt.
Within every selection of groups, the next new group will be available. As a result, you will see in color the panels are already grouped (blue, magenta, and orange), and in white, the panels without a group, that are in the color of the setup.
The final preparation of the sample image would have 3 groups: T-shirt, waist, and shorts. However, we can have as many groups as we wish, as the neoCatalog supports any desired number of groups.