I am using ArcGIS Pro 2.4.2.
My question is similar to Maintain Feature Data without Creating It.
I am looking for a way to update our proprietary parcel layer with a shapefile downloaded from our county source. A truncate and append would work, but there are some fields that are not maintained by the county that are parcel specific (e.g., variances).
Is there a way to replace the updated fields while retaining selected existing fields, or do I need to maintain variances as a separate feature class that I spatial join to the append and truncated parcel layer?