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Welcome aboard to the Community, @ayo-ogunlade.
You'll need to configure the existing items from the Products and Services section to add a category above it (see sample screenshot of the result).
Please follow these steps:
Once done, you can start creating the estimate by clicking the Plus sign and selecting Estimate. The sample screenshot below serves as your visual reference on the outcome:
For additional information, I've attached an article about grouping products and services into different categories: Group your products and services into different categories.
If you have additional questions or concerns while working in QBO, leave a comment below. I’ll be happy to help you out.