Prompt Title: Vue.js Multiselect Box

Sure, I can help you with that. Here's an example of how to create a multiselect select box in Vue.js, using the Vue-multiselect library.

First, you'll need to install the library by running the following command in your project directory:

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npm install vue-multiselect --save

Next, you can create a component for the multiselect select box. Here's an example:

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<template>
  <div>
    <multiselect v-model="selected" :options="options" :group-values="groupValues" :group-label="groupLabel" :multiple="true" :close-on-select="false" placeholder="Select options"></multiselect>
  </div>
</template>

<script>
import Multiselect from 'vue-multiselect';

export default {
  components: {
    Multiselect,
  },
  data() {
    return {
      selected: [],
      options: [
        { name: 'Group 1', children: [
          { name: 'Option 1' },
          { name: 'Option 2' },
          { name: 'Option 3' }
        ]},
        { name: 'Group 2', children: [
          { name: 'Option 4' },
          { name: 'Option 5' },
          { name: 'Option 6' }
        ]}
      ],
      groupValues: ['Group 1', 'Group 2'],
      groupLabel: 'name',
    };
  },
};
</script>

In this example, we're using the Multiselect component from the Vue-multiselect library, and passing in some props to configure the component.

The v-model property is used to bind the selected options to a data property called selected.

The options property is an array of objects, where each object represents a group of options. Each group object should have a name property, which will be used as the label for the group, and a children property, which should be an array of option objects. Each option object should have a name property, which will be used as the label for the option.

The groupValues property is an array of strings, representing the names of the groups. This will be used to group the options together in the select box.

The groupLabel property is a string, representing the property name to use for the group label. In this example, we're using the name property.

The multiple property is set to true to allow the user to select multiple options.

The close-on-select property is set to false to keep the dropdown open after a selection is made.

Finally, we're passing in a placeholder property to display a placeholder text in the select box when no options are selected.

That's it! With this code, you should be able to create a multiselect select box in Vue.js with categorised groups and the ability to select multiple options.