QB Issue Resolution:

QuickBooks Online lets you copy an estimate to an invoice. This changes the status of the estimate from Open to Closed. You can only do this once, so billing your customer one at a time is currently not possible.

You can send feedback to our product engineers by clicking on the Gear icon > Feedback.

Resolution for Issue 'What happend to being able to bill percentages of or individual line items from coustomers estiments??' available: Yes (Solved).
Source: Intuit Community forum.

What happend to being able to bill percentages of or individual line items from coustomers estiments??: 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 coustomers
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Error Recovery for coustomers [Canada]
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