Let's say you use the oc expose service command to create a route named route001.

oc expose service service001 --name route001

The oc describe route command can be used to list labels the route has.

~]$ oc describe route route001
Name:                   route001
Namespace:              foo
Created:                About a minute ago
Labels:                 app=webserver54-openjdk8-tomcat9-openshift-rhel8
                        app.kubernetes.io/component=webserver54-openjdk8-tomcat9-openshift-rhel8
                        app.kubernetes.io/instance=webserver54-openjdk8-tomcat9-openshift-rhel8

The oc label route command can be used to apply additional labels to the route.

~]$ oc label route route001 route-type=default
route.route.openshift.io/route001 labeled

And the oc describe route command can be used again to see the additional labels that have been applied to the route.

~]$ oc describe route route001
Name:                   route001
Namespace:              foo
Created:                About a minute ago
Labels:                 app=webserver54-openjdk8-tomcat9-openshift-rhel8
                        app.kubernetes.io/component=webserver54-openjdk8-tomcat9-openshift-rhel8
                        app.kubernetes.io/instance=webserver54-openjdk8-tomcat9-openshift-rhel8
                        route-type=default

And here is how you can remove a label. In this example, the route-type label will be removed.

~]$ oc label route route001 route-type-
route.route.openshift.io/route001 labeled