QB Issue Resolution:

To copy an invoice

Find/locate the Invoice to “Copy”
From the footer, click “More”
Select “Copy” from the drop-down selector
It will crate a copy of an Invoice form
Revise as needed and save the Invoice
See screenshot photo for reference
The same process also applies to Estimate.

Resolution for Issue 'How do i Duplicate invoices and estimates . we would normally go to edit and select.' available: Yes (Solved).
Source: Intuit Community forum.

How do i Duplicate invoices and estimates . we would normally go to edit and select.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Estimate
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