On the Frequency tab in the work order plan created from the work order group - you have an action to Create one-off frequency for this plan.
After selecting - you need to provide date for the frequency. You can also specify if the frequency is corrective and specify detailed description.
It will create a new one-off frequency to the work order plan.
On the work order group assets you have similar action. This action supports multi-selection. So you can add one-off frequency to selected assets.
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