Form With Subform Doesn't Show Totals Unless Keyed

I have an application that has two tables, linked on a common key. The main data entry form is for invoices, and has a sub-form for parts used. A similar report/sub-report is used for reporting.

Everything is fine for records that are entered via the form. My problem is that when I import data from other sources ( consolidation process ) the calculations are not performed. So when those records are displayed no totals appear until I click on a control that drives the calculations. I don't want to store totals in the database but I need to have them reflected on the viewed form without operator intervention. Otherwise I'm open to incorrect decisions when the operator doesn't notice that an invoice doesn't reflect the cost of parts used.

I'm looking for a "one-time" process that I can invoke after loading new data that would "touch" each record (ideally each "new" record but there's no impact to re-calculating existing ones) and drive the calculations so that the viewed form is correct.

It doesn't need to be "easy" or automated since the end users won't do it, only myself as part of the data consolidation.

Any ideas?

Thanks