Updating the Corporate multiplier in middle of the comp Cycle

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Dear Experts, we currently have open the comp cycle with a placeholder company multiplier.  However, once Board approves it, I would need to update that to reflect on worksheet while the compensation is almost close to finishing. Once I make this change, Do i need to run a full refresh?  If not, which option is advisable to reflect the new company multiplier?  Additionally, What should I consider to ensure no other information has any incorrect implication?  Do I need to ensure proposed % field is not set to refresh so it does not "erase"?  I have never done this in past so