If you want to create a section, which is made up from other sections, you can place the existing sections using the Place Section command from the Shape menu. You can place standard sections from the Sections Library as well as sections you have drawn and stored previously.
To place a section
§ Choose Place Section from the Shape menu
A dialog box will appear allowing you to pick the section you wish to place

§ Click on the group and section name of the required section
§ Click the OK button
The chosen section will be placed in the Shape window.