Suitelet w/Sublist: Push only checked lines as search filter in scheduled script

I've created a custom record to which 'customer' is the parent.  Under that custom record I've set a custom 'rate class' which overrides the rate on invoice transactions based on the date of service provided.  All of this works fine so far.

My next challenge is to create a process to bulk create the invoices for a given date.

So far I've created 2 suitelet forms...'suitelet_1' grabs information from the rate schedule, and when submitted passes the necessary parameters to populate some filter information for 'suitelet_2', which calls a saved search (of type 'customer') and populates a sublist with checkboxes next to each result.