Hi,

Try like following.

 // Import this in both files
    const { posbus } = require("point_of_sale.utils");

    // use this inside the function where you need to trigger the action
    posbus.trigger('a-unique-custom-name');

    // Import this in the file where you want to receive the action
    const { useBus } = require("@web/core/utils/hooks");

    // Add this to the setup function of your component
    useBus(posbus, 'a-unique-custom-name', this.functionName);

    // define your function

Regards