Hello Nick,
One possibility for creating a history for a specific facet would be to create a FISH history (doc here). This would require looping through all contacts on the specific facet, summing the forces and writing the result to your FISH history.
This could become computationally inefficient if there are many contacts on the facet (as the FISH history will be called every ten cycles). If quick computation is important, you could consider using FISH operators (doc here).
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