public class SupplierViewModel
{  
   public string name { get; set; }   
   public AddressViewModel AddressViewModel { get; set; }=new AddressViewModel();    }

public class AddressViewModel
{
   public string phone_mobile { get; set; }
   public string address1 { get; set; }
}

public class Supplier 
{      
   public int Id { get; set; }   
   public string name { get; set; } 
   public virtual Address Address { get; set; } 
} 

CreateMap<Supplier, SupplierViewModel>().IgnoreAllUnmapped()  });
CreateMap<Address, AddressViewModel>()
var viewModel =
         await  _suppliers.AsNoTracking()
                   .ProjectTo<SupplierViewModel>(parameters:null,configuration: _mappingEngine.ConfigurationProvider)
                   .FirstOrDefaultAsync(a => a.Id == id);