You can add existing elements to folders.
A folder is a convenient way of grouping together model elements; for example, all elements that are used by a particular business activity. A folder does not own the elements it contains. Ownership remains with the folder’s parent element, meaning individual elements can be contained in more than one folder.
The Add Existing Element option enables you to select the elements you want to see in the folder. Elements can be added from either, Solution Explorer, Class View or the Members tab.
To add an existing item, perform either of the following:
Select a folder from any of the views described in Adding System Modeler Items.
Either right-click and select Add Existing Item, or on the File menu, select Add Existing Item.
The Add Existing Item dialog box is displayed, which contains the elements available to be added to the selected model or folder. If no elements are available the dialog box is empty.
Either scroll or use the Name field to locate an element.
Select the required element.
Click Open.