Hi,
As above explained by Mr. Harsha for cost tabs in MO.
So, Please find this link for more information about cost tabs.
http://help.sap.com/saphelp_47x200/helpdata/EN/c1/3769b7449a11d188fe0000e8322f96/frameset.htm
http://help.sap.com/saphelp_47x200/helpdata/EN/f8/4169776cb011d2a5a70060087a7a74/frameset.htm
http://help.sap.com/saphelp_47x200/helpdata/EN/44/728d86fa2d11d19df90000e8323350/frameset.htm