Programmatically Set Sort Columns in CR2010 API

The Crystal Report has two Sort Fields originally at design
time. However, it might have more than two Sort fields needed at run time, for
example, 5 Sort Fields. In the previous VB6 with CRAXDRT, where its
RecordSortFields.Add function will be doing the job. But in the CR2010, it
won’t be allowed doing so. Do you know which alternative way could accomplish
this job?