%LET flowertype = Ginger;

* Read the data and subset with a macro variable;
DATA flowersales;
   INFILE 'd:\MyRawData\TropicalSales.dat';
   INPUT CustomerID $ @6 SaleDate MMDDYY10. 
      @17 Variety $9. Quantity;
   IF Variety = "&flowertype";

* Print the report using a macro variable;
PROC PRINT DATA = flowersales;
   FORMAT SaleDate WORDDATE18.;
   TITLE "Sales of &flowertype";
RUN;