Creates report pages. Only one report for one device can exist in a project, therefore it's always overwritten, when creating. Different situation is while device list is an overview report. There can be many device list in a project(perhaps with different filters), therefore it's never overwritten when creating a new one. To update an existing list of devices, use Reports.Update function.

public bool CreateReport( 
   ReportBlock oReportBlock,
   string strFirstPageName
)

public:
bool CreateReport( 
   ReportBlock^ oReportBlock,
   String^ strFirstPageName
)