I have a FGDB with many feature classes. I need a "FeatureID" field it should be auto generated with a sequence number while adding a new feature in Edit session. It is like the existing field "OBJECTID". It is like auto numbering while adding new feature
As you have tagged your question as ArcGIS Desktop I assume you are open to using ArcGIS Pro. If so explore the Attribute Rules as a way of auto numbering. Be aware of the cautions in the help file as you'll be changing the version of your database and ArcMap users won't be able to access the data.