I have a number of examples of how to update the parent record but I'm still really shaky on how to do it.  For the time being, I'll figure that out, but once the main record is updated (quantity on hand is correct) I need to prevent the record from the subform from being called back and edited. (I need to keep the records for tracking the traffic on a given item).

How can I do that?  Is there some way to make a record "read only"?