Is it possible to create drag and drop action in 360 window. It looks like the option is grayed out.
No. You can only add hotspots to the project, which are interactive objects allowing you to show some static objects (text/image/audio) or question slides. The other actions you'll find in the dropdown list are navigation etc.
However you can have a project with 360 slides and a normal D&D slides. A 360 slide can be inserted in each project, but those slides don't support Question overlay slides to display by a hotspto. Use the navigation xommands in the hotspot action list to navigate to the DaD.
Have a look at: