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You’ll need to create an estimate first before the invoice. In your case, since you already created an invoice, I suggest deleting the invoice and creating an estimate so you can link it to the Invoice afterward.

Here’s how to delete an […]

Resolution for 'Category option issue: 'i need to copy an invoice and make it an estimate.Can I do that and how.' available: Yes.

The Category option 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 Category option issue yourself by looking for a resolution described in the article. If it is a complex Category option issue or you are unable to solve the issue, you may contact us by clicking here or by using other Category option support options.

For more information about resolving issues related to Category option in Quickbooks/QBO or to get support for the issue 'i need to copy an invoice and make it an estimate.Can I do that and how.', click the link below: