You don't now how to use them? or how to create them?
 
Queries are the best !!!
 
SELECT BKAP_PO_VNDNME, SUM(BKAP_PO_SUBTOT) AS TP FROM BKAPHPO  
WHERE BKAP_PO_ORDDTE > '2013-12-31' AND BKAP_PO_ORDDTE < '2015-01-01'
GROUP BY BKAP_PO_VNDNME ORDER BY TP DESC;
 
It will show all 2014 purchases, order by top to bottom (biggest vendor)
 
Have fun  
 

 
Kelloggs