This subroutine creates a new pic chart sector spec for the "current" chart, and optionally adds a label. This is an easy way to add data and labels to your pie chart simutaneously. If you want to change the attributes of the sector just added (ie, 3D Depth, Color, etc), do that before adding the next sector. Any changes you made to the attributes of the newly added sector will be inherited by the next sector you add, unless you pass 'initialize' as the <text_spec_name> parameter (see below).