Product Feature: Work Center
If any action is performed on a strand, such as a branch, merge or publish, then a version label is applied on the strand. The label is shown in the History view. This view covers everything from the initial creation of the original object to the current version and shows all branches, merges, publishing, and labeling.
Branches which is a strand or merged with other branches or no longer required can be deleted. Right-click on the particular strand and select delete. Prior to deleting, take a full Designer repository backup.
There are certain objects that cannot be branched such as Default Resource Map, Code pages, Font library, and locale resources. These system objects are available for all strands, including the Master strand.
UPDATED: August 23, 2019