Early in my exposure to F5 BIG-IP I was involved in a load balancer migration project from our existing hardware to F5 Load Balancers. This involved the migration of several hundred configurations, ...
Never mind I think this will be helpful to others for version 11.x. in each case check the status
tmsh load sys config merge gtm-only verify file eg. /var/tmp/file.txt
tmsh load sys config merge gtm-only file eg. /var/tmp/file.txt