Download code to allow you automate the process of transferring field domain descriptions via python.
The steps:
a) Fork code from this Github repository
b) Download sample data to try it out
c) in the script find the below lines of code an update accordingly
#Workspace
_workspace = r"C:\DAVID-MUTHAMI\GIS Data\Namibia ULIMS\GIS\Datasource\Rundu\Database\rundu.gdb"
env.workspace = _workspace
#Feature class used in system
featureClass = "rundu_Parcels"
oldField = "ru_zoning_id"
newField = "ru_zoning_id2" # ru_township_id2 ru_zoning_id2
domainName = "rundu_zoning" # rundu_township rundu_zoning