How to Change Security Architecture to define at Node Level in SAP BPC

Hi,

We have a situation to wait for Master data loads to be completed for new company code updation in SAP BPC system,For that we need to wait till some day after PEC(period End Closing) for every new company updates.do we have any streamlining procedure for this instead to wait till PEC to be completed. how to Change Security Architecture to define at Node Level or how to streamline the process of MD updates.