OpenSpan does not automate applications using mouse operations. Instead OpenSpan communicates with applications through a process to process messaging system. It really would depend on the type of technology this GUI application is using and also the object types of each of the list containers. This information can only found through undergoing our interrogation process with OpenSpan Studio.
Once this is revealed, you can then navigate the available options that are returned from the interrogation to determine the best means to simulate the drag and drop action through OpenSpan automation.