Thanks for joining this thread, @Rebecca77. 

Custom and Notes fields have a 30 and 4095 character limit, respectively. Being able to enter more characters in a given field would be helpful. It takes out any unnecessary steps like using a spreadsheet as an alternative. Rest assured that I'll relay this message to our team in concern here on my end and add your vote for this one.

I'm also linking these resources for more information:

• Character limitations for fields in QuickBooks
• Create and edit custom fields in QuickBooks Online Advanced

You can also share your thoughts and ideas through your account. Our product development team reviews all the feedback we receive to ensure we’re meeting the needs of our customers. 

Here's how:

1. Select the Gear icon at the top, then Feedback.
   
2. Enter your comments or product suggestions then select Next.
3. You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
4. From the drop-down, choose the appropriate category, then select Send message.

For your reference, check out this link: How to Submit Feedback. To learn more about recent improvements, news, and product enhancements, visit the QuickBooks Blog. You’ll also get suggestions on how to grow the business.

Drop me a line if you need more help with customizing your sales forms in QuickBooks Online. I'd be happy to assist you. Thanks again for reaching us and have a great day.