Parent w/Multiple Child records - Slice vs Data

[PJMatelli]

Hello all,
I have an App where we are tracking accidents that happen in our company. I have a Google Sheet with multiple tabs. There is the Accident Data tab and then I have Witness Information tab and a Corrective Action tab. The last 2 (Witness and Corrective Action) can have multiple records for one Accident Data record. I have ReportID as the common field between the 3 tabs. I am trying to create subforms for the Witness and CorrectiveAction components. I have tested this concept on another app and it works great. I am trying to make it work on this App which has the New Report data referencing a Slice. My sample app doesn’t use a slice. Is it possible that the subform concept doesn’t work with slices?

Thanks in advance…