I need to split a payment to a supplier into 3 categories?

Hi kaygaffy,

Thanks for posting in the Community! Let me walk you through on how to split supplier payment in QuickBooks Online. 

1. Go to Bookkeeping, select Transactions, then select Bank transactions.
2. Select the transaction to expand the view.
3. Make sure Categorise is ticked. 
4. Then click on Split transaction hyperlink. 
5. Select a supplier, Category, GST and enter Amount of each category. 
6. Select Apply and confirm. 

You can also check on this article on how to manage your transactions in QuickBooks Online. 

Feel free to drop a comment below if you have any other questions with splitting transactions. I'm here to help. Have a great day!