Hi @Paul
Maybe you can use CreateCatalogItem function
public ReportService2010.CatalogItem CreateCatalogItem (string ItemType, string Name, string Parent, bool Overwrite, byte[] Definition, ReportService2010.Property[] Properties, out ReportService2010.Warning[] Warnings);
Reference document :https://learn.microsoft.com/en-us/dotnet/api/reportservice2010.reportingservice2010.createcatalogitem?view=sqlserver-2016
Best Regards,
Isabella