Hello QCS_Rek,

Thank you for reaching out to us here in the forum. with regards to your concern, QuickBooks does not support creating custom estimates directly through an import form style. I highly recommend to reach out to our QuickBooks Online support.

Use the HELP function(?) located in the upper right corner and read the step-by-step instructions to contact QuickBooks Online Support in our help article https://quickbooks.intuit.com/learn-support/en-us

For other questions and concerns, the Community Team is always here to assist you.