Functionality is available in the Pro edition
To merge series from different studies:
The order of selecting series is important. The first (basic) series of images is located behind the second series in the flat image view window. The volume model is based on the first series, and even if the second series covers a larger volume of tissue, only those pictures are used in the reconstruction, the location of which is the same in both series, and others are ignored.
Merged series can be opened in the Volume Reconstruction, Multiplanar Reconstruction, Screw Installation and Virtual Endoscopy windows.