4.2.4. Removing Molecules From a Class
You can change the contents of a class by performing selected deletions. To delete one or more molecules from a class (but not from the spreadsheet), you must first select the class of interest in the Classes tab, then transfer all its molecules to the Compounds tab by selecting:
CLASSES>>Display Selection In Compounds Tab.
Once in the Compounds tab, select the compounds of interest and use:
CHEMISTRY>>Remove Compounds From Class.
Note that a deleted molecule will form a new singleton class only if it is not already contained within another class.