Could you help me since I deleted a supplier who already had transactions?

Let's reactivate your supplier to restore their profile, so you can manage their transactions again in QuickBooks Online (QBO), Mixila.

When a supplier is deleted in QBO, any transactions related to them (like bills, expenses, or payments) remain intact in the system. You'll just have to reactivate them to continue managing their transactions. Here's how: 

1. Go to Expenses, then Suppliers.
2. Select Settings ⚙ from inside Supplier screen and select Include inactive to show all inactive list items. 
3. Locate the supplier you want to restore.
4. Under the Action column, select Make active. 

Once activated, open their profile to check all their related transactions.

If you have additional concerns, feel free to reply. We’re here to help.