Opening Linked Report

[Melody]

I have an Orders form that includes a Kit Ready date. On this form also is a command button (Packing Slip) that opens up the Packing Slip (report) associated with that order. I want to make a report or macro to put in the OnOpen event of new report that pulls up all Packing Slip reports meeting the criteria of IsNull in the Kit Ready date field. I'm confused on how to do this, as Packing Slip is a report found on my Orderd form. Any ideas???

Thanks!!!