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