Hi david,
You're given a read-only access of your data for one (1) year after you've cancelled your account. Let guide you on how to access your PO.
- Click Expenses on the left menu.
- Select Expenses.
- Click Filter drop-down arrow, select Purchase Order under the Type field.
- Click Apply.
Here's an article for more information about what happens to your data after cancellation: What Happens To My QuickBooks Online Data After I Cancel.
I have this link in case you have other questions with QBO: Help Articles.
Reach out to us if you have other concerns. I'd be glad to help.