You should use SUM guide. Here you can find this one:
https://service.sap.com/~sapidb/011000358700000783082011E/SUM10_Guides.htm
See also this site related to SUM:
You should use SUM guide. Here you can find this one:
https://service.sap.com/~sapidb/011000358700000783082011E/SUM10_Guides.htm
See also this site related to SUM: