Mass Updating Records to Populate Field in Subpanel

I'm looking for ideas on a way to solve a problem I've run up against.

I have 2 new fields that have been added to a custom subpanel on our Account records. They only populate after a related record has been updated in some manner. I'm wondering if there is a good way to force a mass update of the related records to force the population of the 2 fields or if it needs to happen organically as records are updated.

The fields I'm referring to in the image below are the Pipeline Stage and Action Stage of the Projects subpanel.

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