Function RouteFileRecordAddSection(link: integer; startpercent,endpercent: double): integer;
This will add a section to the current record. A section is here a full link from the street network or perhaps just a smaller part, if you define either startpercent<>0 or endpercent<>1.
You should call this function as many times, as you have defined in the call to RouteFileRecordAdd, the numsections parameter.