To merge two annotations, make a right click on the annotation and from the menu that pop-up select either CTRL+A to merge with next annotation and CTRL+B to merge with annotation before. For detailed explanation on merging see Section 2.9.20.
or . Use can also use shortcut keysTo split an annotation, make a right click on the annotation at the point where the annotation is to be split into and select Section 2.9.19.
from the menu that pops up. For more information see