Hi,
you can do it with the transaction code PKMC, but you have to activate the business function LOG_PP_LMAN_02 (TC SFW5). This business function is a part of EHP 5 for SAP ECC 6.0
http://help.sap.com/erp2005_ehp_05/helpdata/EN/2E/E99624B22D4BA9862FBF1D9AE7792A/frameset.htm
After the activation of the business function, you have to run PKMC, tick mark the field for mass processing, go into change mode, and press F8 (execute). The toolbar will be extended with buttons, which can be used for mass update.
You can update the single fields with different values, but you can also update several control cycles at once, by selecting the relevant column and rows.
Best regards,
Gunnar