```ts
// YourComponent.stories.ts

import { Story, Meta } from '@storybook/angular/types-6-0';

import YourComponent from './your.component';

// a function to apply some computations
const someFunction = (valuePropertyA: string, valuePropertyB: string) => {
  // makes some computations and returns something
};

export default {
  component: YourComponent,
  title: 'A complex case with a function',
  // creates specific argTypes with options
  argTypes: {
    propertyA: {
      options: ['Item One', 'Item Two', 'Item Three'],
      control: { type: 'select' } // automatically inferred when 'options' is defined
    },
    propertyB: {
      options: ['Another Item One', 'Another Item Two', 'Another Item Three']
    },
  },
} as Meta;

const Template: Story<YourComponent> = (args) => {
  const { propertyA, propertyB } = args;

  const someFunctionResult = someFunction(propertyA, propertyB);
  
  return {
    component: YourComponent,
    props: {
      ...args,
      someProperty: someFunctionResult,
    },
  };
};
```