CONVTOSURFACE command
Converts entities to Surface entities.
            Description
Converts valid 2D and 3D entities to Surface entities. Valid entities include:
- 2D Solid
 - 3D Solid
 - Region
 - Open Polyline with non-zero thickness and zero width
 - Line with non-zero thickness
 - Arc with non-zero thickness
 - Circle with non-zero thickness
 - Mesh
 - Planar 2D Face
 
Method to convert to surface
There is one method to convert entities to Surface entities:
         - Select entities
 
- Select Entities
 - Begin converting an entity to a Surface entity by selecting a valid entity then:
 - Select entities
 - Select another valid entity or press Enter to complete the command.