If i issued two invoices and after saving realised I used credit instead of Invoice type transactions. can I change the type or must I redo the entire transactions?

Hi there, accounts354.

Currently, there's no option to change the credit note to invoices. You'll need to delete the credit note and redo the entire transaction as an invoice.

Here's how:

1. Click the Sales menu at the left panel.
2. Choose the All Sales section.
3. Find the credit note that you've created. Then, double click it to expand the page.
4. Click the More button and choose Delete.
5. You'll be prompted with Are you sure you want to delete this? Click Yes to confirm.

Once done, you can now start entering and issuing invoices to your customers.

Here's how:

1. Click the + New icon and select Invoice.
2. From the Customer dropdown arrow, choose a customer. Make sure all of their info is correct, especially their email address.
3. Check the invoice date. Then from the Terms dropdown arrow, select the due date.
4. Choose the Product/Service. You can also select +Add new to create a new product or service right from the invoice.
5. Enter a quantity, rate, and change amount if needed.
6. Select a VAT rate.
7. Hit Save and send or Save and close.

For additional information, you can click this article: Create invoices in QuickBooks Online. This also provides a link on how you can enter invoice payments manually.

Please refer to this article to see steps on how you can customise your sales forms to personalize them to helps you establish your company's brand: Add, customise, or remove logos on sales forms.

I'm always here to help if you have any other QuickBooks-related concerns and questions. Feel free to tag my name in the comment section.