Hi. To move work orders from AS400 into ArcGIS, I would suggest you look into Workforce for ArcGIS. Essentially, you will need to take your AS400 CSV and append the workorders into the Worforce for ArcGIS assignments feature layer. This can be done, for example, programmatically using a Python script or with FME (from SAFE software). Workforce and Survey123 can be nicely integrated, so the appropriate form can be launched when the Worforce user is working on the assignment.
