Typescript Class as a Member Variable in Angular?

I'm learning Angular and TypeScript and I have a question or two.

With TypeScript can you have one class/object be the variable type for an other object as shown below? If so how do you reference the all of the members using Angular.

/* begin cmsfiles.ts */

export class CMSFiles {
  fileID: number;
  fileDateTime: Date;
  fileName: string;
  description: string;
}
/* end cmsfiles.ts */

/* begin news.ts */

import { CMSFiles } from './cmsfiles';

export class News {
  newsID: number;
  postDateTime: Date;
  title: string;
  body: string;
  file1: CMSFiles;
  file2: CMSFiles;
}
/* end news.ts */

In the Angular template I will need to use something like this:

<input [(ngModel)]="news.file1.Title" placeholder="title" />

How can I achieve this?