Welcome to the Community! QuickBooks Self-Employed is a versatile program that enables you to manage your business on the go. I'd be glad to share more info so you can continue to be amazing at your work.
The ability to use Purchase orders isn't available in QuickBooks Self-Employed. However, this feature is available in QuickBooks online, specifically on the Plus subscription package. You're more than welcome to send feedback about this feature to our product developers by clicking Assistant > Talk to a human. Otherwise, I'd recommend checking out QuickBooks Online if you'd like to start using Purchase orders for your business. Here's an article that'll help you get started with QB Online.
Give this a try and let me know if you need anything else. I've got your back. :)
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