Merging multiple cases

Hello,

We are trying to merge the data of multiple cases into one single case.

We have tried the following things:

• Get the case data using the getCaseDataUsingScheme method in EntityManagerSOA and then call the CreateCasesAsString method in WorkflowManagerSOA. We did this using Javascript. But the methods didn't work or the parameters we provided were wrong.
• Render the case to the screen and get the data using Javascript. It was not possible for us to get all the data we needed to call the CreateCasesAsString method in WorkflowManagerSOA.
• Create a separate process to use for merging. In this process we have a form where a list is displayed and we can select a case. It is also possible to select multiple using the shift key or holding the mouse. But if multiple are selected and we click the "Save Changes" button only the last one we selected is being saved. In the image attached you can see it is possible to select multiple cases.

Could you please help us making merging multiple cases work?