How to split Context into multiple files?

Question

I am refactoring a large project that has about three hundred tables using . Net Core and Oracle.Entityframeworkcore With scaffold it generates me a Modelcontext. However, it would be huge if I did all the entities in this single Modelcontext. I thought about injecting a context into the dependency and everyone else would inherit it from it but the controller didn’t recognize it. For example, I created this context:

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;

namespace webapi.Models
{
    public partial class TesteContext : DbContext
    {
        public TesteContext()
        {
        }
        public TesteContext(DbContextOptions<TesteContext> options)
            : base(options)
        {
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
        }
    }
}

And this other to inherit from above:

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;

namespace webapi.Models
{
    public partial class ModelContextImoImovel : TesteContext
    {


    }
}

And I tried to inject the dependency like this into Starutp.Cs:

        public void ConfigureServices(IServiceCollection services)
        {
            var connectionString = Configuration.GetConnectionString("DefaultConnection");

            services
            .AddEntityFrameworkOracle()
            .AddDbContext<TesteContext>(options => options.UseOracle(connectionString));


>services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
        }

But at execution he returns to me

Unable to resolve service for type 'webapi.Models.Modelcontextimoble' Any suggestions? Thank you.