Sub factor points are the totals in the Point table on the right hand side of the actual Point Table.  Each half point (0.5) increment has a distinct point value or level value.  The point values are automatically generated for Zero Based and Weight Based Calc. Types.  For Custom Calc. Type you are required to manually enter the point values for each half level increment, to do so, simply click in the corresponding cell and enter the numerical value.  

Note: The Point Table automatically rounds to the nearest 0.5 value.