I have a nested structure like this:

REPAIR ORDER 1   / John Doe / 2024 Charger
  INTERVENTION 1 / Engine Noise
    POSITION 1   / Labor
    POSITION 2   / Bearing
  INTERVENTION 2 / Tyre Change
    POSITION 1   / Labor
    POSITION 2   / Michelin Tyres
REPAIR ORDER 2   / Williams O'Sullivan / 2023 Corolla
  INTERVENTION 1 / Wheel alignment
    POSITION 1   / Labor

So there are three tables, REPAIR ORDER (RO), INTERVENTION (IN) and POSITION (PO).

Here are example tables (in production I import them from a as400/ibmi via a c# script via a created c# odbc/dataverse connector):

REPAIR ORDER (RO)