This menu gathers basic utilities allowing to perform simple structures manipulations. All of them usually require only one or two commands in the matlab window, so most people having basic knowledge of matlab will find it quicker to just ignore this menu.
The structures that you may manipulate here include continuous and discrete wavelet transforms, graphs and simple matrices or vectors. A common principle in all sub-menus is that each time you need to give a name to an output structure or enter a name for an input structure, you may get it from the Variables list of the main window, by first selecting the structure with the appropriate name in the list, and then pressing the Get button in the sub-menu.