How do people imports custom models into the editor without having to go into the settings and manually create every unit and doodad?

I downloaded like 300 custom models for buildings and units and so on that I want to use for a custom map. Is there any programs or plugins or anything where I can just drag and drop them and have them show up in the editor without having to do the custom model import and then create a new unit or doodad in the editor and assign a texture and so on