Realized after I created t4's that our company address was incorrect. I have rectified that in all placed but how do I delete and re create t4's with correct address.

Hello frasersplumbing-, 

Welcome to Community!  It's great to hear that you've made the necessary changes to your Company address.  QuickBooks Online enables you to delete the current T4-slips, so you can create and file them with confidence. I would be glad to assist!

Follow these step to locate and delete the T4-slips;

1. Open Payroll, then Payroll tax

2. Select the Filings tab, then Archive

3. From the ▼ dropdown menu on T4 Employee slips, select Delete. 

Here's a helpful guide for your reference.

Should you require additional assistance, please don't hesitate to reach out to our QuickBooks Online Payroll specialists. 

Feel free to reach back out, if you have any other questions. We are always happy to help!