Sub form not updating all rows of another subform

Sub form not updating all rows of another subform

Hello, i have a form in creator that has two subforms in it. both subforms have a dropdown that i am trying to make related. i want to get the dropdown inputs from each row of the first subform and display them as options for a dropdown in the other subform. so far i have gotten it to perform this function but it only does so for the first row of the second subform and i cannot figure out why or how to get this to function properly, any help would be appreciated.

this is the current script running on input of the the first subforms dropdown
for each  subrow in Shipment_Configurations
{
Packing_List_Items.PACKAGE_ID:ui.add(subrow.Package_ID);
}

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