I am attempting to configure the Hazards Reporting Solution that ESRI has for our Emergency Operations Center. I added two fields "Product Type" and "Product" to the Hazards layer. I need to make the Product Type field a subtype for Product so that when staff in the field are recording a spill they select "BioHazard" from Product Type and then only see the BioHazard domain coded values list for them to choose, not all 50 options but then just the 5 options. Using Pro "Create/Manage Subtypes" is greyed out. In AGOL or Developers AGOL, I can't see a way to assign or define the subtype for use in Collector. Any help or guidance would be much appreciated!