I have a lightning component that redirect to an external url. I need to use that component as an action in my list views. How do i implement this. I know actions can be put on the list views using search layouts, but when i am creating an action using lightning component i am unable to get the action in search layout in the column
Currently you can't call a lightning component as part of list actions. You will have to go visualforce route(I'm not sure about Lightning component in a vfp but its worth giving a try). What your're looking for is in salesforce future road map.
For reference look at Lightning quick Action in the List view