For setting up multiple print queues in Windows, in Control Panel>Devices and Printers, click on add new printer, and select the printer you want the second queue for, and agree to use the driver already installed, and give it a name, eg. "Mug transfers"
You can then also look in the print driver options, and set schedules that the different queues will print during - so could have one which only prints overnight etc ... we often set the hard products which are slower as need higher quality to print overnight, and only let the fabrics transfers print during the day.