Once you have drawn a section to your satisfaction, you can install it into the Sections Library for later use by Multiframe or Section Maker.
To install your section
§ Choose Add to Library… from the Shape menu
A dialog box will appear which lets you specify where the section will be stored, a field for the name of the section, a table with the calculated section properties and a pop-up menu to indicate the shape of the section.

§ Type in a name for the section
§ Choose the name of the group where you want to store the section
§ Choose a shape for the section (or just leave it set to unknown)
§ If you wish you can change the sections properties to override the ones that have been calculated for you. Click on the number to be changed and type in a new value.
§ Click the OK button
The section will be stored in the library in the group you have nominated. Note that the library with the new section included will not be saved permanently on the disk until you choose Save Library from the File menu.
If you have Multiframe running, you can now choose Save Library, then switch to Multiframe and choose Open Library->Sections Library from the File menu to reload the library into Multiframe. This will make the section you have added available for use in Multiframe.