You can define frequency for a time-based preventive maintenance (PM) record to specify how often work orders are generated from it. For time-based PMs, the generation criteria is based on elapsed time since the target start date or completion date of previous work.
If the PM is associated with a master PM, updates to the master PM record overwrite changes you made to the frequency of the associated PM. If you want to prevent updates by the master PM, select the Override Updates from Master PM check box on the PM tab.