循环有条件地导出表SAS（大量变量）

So I am trying to break up a large dataset (70,000 obs with 1,790 variables) based on a specific variable grouping. Excel or CSV is the ideal format to export to, but there is a limitation on variable numbers (260 or something). Any ideas how I can do this in SAS (or R / SQL otherwise)?So I am trying to break up a large dataset (70,