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You'll want to add a new style or import custom form style for an estimate. Here's how:
To add a new style
Another way is to import your custom form style in QuickBooks Online (QBO). Here's an article for the detailed steps: Import Custom Form styles For Invoices or Estimates.
I've added these help articles in case you have questions about QBO,
Please touch base with us if you need anything else. I'll be here to help.