Can I change the custom transaction numbers? I need to turn it on. If I can't trun it on, what account is able to do it?

Hello there, leonardo.tovar,

Let's turn on the custom transaction numbers feature so you can set your numbering preference.

QuickBooks automatically assigns numbers to your transactions unless you turn on Custom transaction numbers. Once turn on, this will add an Invoice no. field where you can enter any number format you want.

Here's how: 

1. Go to the Gear icon, then choose Account and Settings.
2. Select the Sales tab.
3. Click anywhere within the Sales form content section.
4. Check the box next to Custom transaction numbers.
5. Click Save and then Done.

Once done, open an invoice or any sales form. In the Invoice no. field, enter the custom number you want to use for your forms. The sequence you set here applies to all sales forms.

By performing the steps above, you'll be able to turn on the Custom transaction numbers feature in QuickBooks

For additional reference, you can go through these articles: 

• Customize your transaction numbers
• How to change the invoice number on sales forms

Please don't hesitate to leave a comment if you have further concerns how to maximize and make use of the features in QuickBooks. I'm just around if you need help.