In QuickBooks Online (QBO) Australia, the ability to create or enter a direct debit payroll for subcontractors is currently unavailable.
I can see how having this option would be helpful for you and your business. Rest assured that I'll pass along your suggestion to our Product Developers. They're always looking for ideas to consider on how to improve QBO.
In the meantime, I recommend visiting our Blog site. This is where we share recent happenings and future developments, such as updates to newly added features.