Thank you for joining this conversation, Aparajita. Your willingness to engage and contribute to this discussion about how to map and auto-fill custom fields from invoicing customers' record fields.

The option to map custom fields and autofill isn't currently available in QuickBooks Online (QBO). Nevertheless, we value your input and ideas about having this option and recommend you submit a feature suggestion directly to our Product Development Team. 

I'll show you how you can send one: 

1. Locate the Gear icon.
2. Under Profile, choose Feedback.
3. Enter your feedback suggestion.
4. Hit the Next button.
   
   

You can stay up-to-date with the latest news about product enhancements by reviewing Intuit's Product Updates webpage. You can select your country on the bottom part of the page to ensure you're updated with the newest improvements accordingly. 

I remain prepared to provide further assistance managing custom fields in QBO, Aparajita. If you have any additional inquiries or require clarification on this topic, please feel free to share them by commenting below. I will promptly address your concerns as soon as possible, ensuring you receive the guidance you need.