I have a script that does a recalc on a sublist (custom record) that is in a transaction whenever a line it added via inline. The recalc takes the value and updates a field on the transaction. Script works great but I know need to have this work retroactively - so that previous entries are recalculated. What is the best way to achieve this?

By work retroactively you mean you need to run something to go modify all the old records that have already been modified and missed your recalc when it happened? Sounds like a map/reduce to me.

Correct.

Create search to find transactions that need to be modified (getInput), group the results together, if needed (map), process the transaction as a whole (reduce) would be initial thought.

I'll give it a shot. Thanks.