The ‘export’ manual says:
The command can be invoked at any menu level, and it acts for that menu level and all menu levels below it.
But it seems that it doesn’t works for ’ /interface ethernet switch port-isolation’:
[root@OF Cusmano: Main] /interface ethernet switch> export
# mar/24/2019 10:46:56 by RouterOS 6.44.1
# software id = 7L9B-N4Z9
#
# model = CRS317-1G-16S+
# serial number = 80A1075348F7
[root@OF Cusmano: Main] /interface ethernet switch> port-isolation
[root@OF Cusmano: Main] /interface ethernet switch port-isolation> export
# mar/24/2019 10:47:10 by RouterOS 6.44.1
# software id = 7L9B-N4Z9
#
# model = CRS317-1G-16S+
# serial number = 80A1075348F7
/interface ethernet switch port-isolation
set 15 forwarding-override="sfpp01-Sede(A),sfpp02-Sede(B)"
[root@OF Cusmano: Main] /interface ethernet switch port-isolation>