How to delete shipments history collected from OPS for last one month

Summary

How to delete shipments history collected from OPS for last one month. We used seeded collection to collect shipments history from fusion (OPS).

Content

We are trying to delete shipments history collected via seeded collection job for last one month only. That is we are trying to delete all shipments history for the month May 2021. We can't use FBDI because the data was collected using standard collection. We can't use Adjusted Shipments History to override manually, more than 100K records. 

I tried using seeded job 'Purge Data Repository'. In the 'Demand Planning Data', we have the options to limit the number of days to purge data. However, both the options don't facilitate a way to purge last one month data only. Either it allows to purge the oldest data or allows to retain the latest/recent data. Not sure how to leverage these options to purge only one month's data (recent month).