Labeling:- Labeling is required when we want to do code migration from one ENV to another ENV. Lets say i have to move 10 workflows from Dev to Test out of 30 workflows in a Folder. So in this case create a label and then apply to the 10 workflows which needs to be migrated. ref the below link for Label creation.
How to Remove the label
To Remove label first we need to connect to repository manager.
Lets say i want to remove Label for a target, then I need to go TARGET folder and then go to the applicable target object. Similarly for source, mapping, session and workflow(U need to go to respective Folders to remove the Label).