If you want to use combinations of objects in the future, you can save them in the library. First, you have to group the objects. Select all the articles in wall-view, holding CTRL or drag a rectangle over all the articles. Right-click and select Grouping > Group (or use hotkey CTRL + G).

The objects are grouped. Right-click again and select Save to library… or save to custom database…(object will be saved directly in .custom objects > default. You will have to edit the properties in the sanitary browser).

Save to library saves the group in the objects (mural) library. You can make new folders and save groups of objects. If you prefer to save a file on your hard disc or in the sanitary browser, use Export to file… You can import the group in the sanitary browser under .custom objects or even use the file in other software.