Hi,
If the relationship to the parent is a master detail, you could create a roll up summary field on the parent that woudl sum the total price.
In the object in the related list, you can then create a formula field:
Parent__r.RollUpSummary
If it's a lookup relationship, it's a lot harder. You would need code or flows that would trigger on creation or when a price is changed on the child object. You would then have a Get Record to check all the other related records, related to the same parent record. You would now loop through them and add the Total Prices and finally update all these child records with the new tally.
You would need another flow on delete to subtract to the total.
The issue with flows or code is that it only triggers on creation or update of a record, so, for existing records, you would need to do a mass update, either manually (data laoder for example), or with a scheduled flow/apex
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