The question has 2 parts: In ArcGIS Pro, If you import symbology from a layer that has labeling activated, the labeling gets imported as well. I have not found an option to define a new labeling field. I use the value field for defining the field for the symbology (side question: why do I need to define the original field manually? this should be part of the layer definition and can be difficult to remember.) Is there a similar way to define the label field name or not to import the labeling?
In my current project, after importing the symbology, the labeling expression contains a field that does not exist. When I try to set it to an existing field (by double clicking on the fieldname in the field list) I get the error "Invalid Expression. No features found.". I am stuck there, no matter if I apply, cancel, deactivate-reactivate labeling. Any ideas? my own workaround will be, to open the lyr-file in an editor and try to change the labeling field manually.