Drag the model element from the xmi
source Editor to the central project model (e.g. EclipseUML target
model where the merge will be completed)..
Select Usecase named UseCase Model Project 2 in the XMI Editor > drag and drop inside the
project one usecase diagram
If you open the project
ModelProjectOne and can see that the dropped element has been merged
existing ModelProjectOne model (e.g
UseCase Model Project 2 has been added inside the project one model).