Within arcgis desktop I created a map, added multiple layers/groups (hospitals, airports, parks, etc). Published it as a tiled map on arcgis online. but when I consume it using the js api I can't hide/show certain layers. For instance I want to click a button and only show the hospitals, but I can't. I read that this can only be done with the dynamic map service, but I can't figure out how to create that type of service within arcgis desktop. Is that possible or should I be taking a different approach? Should I be creating all of these layers (hospitals, airports, parks) as individual feature services?