Create a project budget

 Let me help you how to create a budget, Ludus Magnus.

QuickBooks Online Budgeting feature uses the expense and income. To create a Project budget, you have the option to subdivide the budget per project.

Here's how:

1. In the upper right corner, click the Gear icon.
2. Under Tools, choose Budgeting.
3. Select the Add budget button.
4. In the Name field, enter a budget name.
5. From the Fiscal Year drop-down, select the fiscal year for the budget.
6. Use the options on the Interval drop-down menu to specify whether the budget is Monthly, Quarterly, or Yearly basis.
7. From the Subdivide by drop-down, select Customer then choose the project. 
8. Select Next.

9. Enter the amount per account, then click Save and close.

You can learn more about managing budgets here: Create and import budgets into QuickBooks Online.

If you have other questions, you can always drop by the Community. We'll be here.

@Adrian_A

Please Learn from this input.

@Ludus Magnus

The function is Estimate. That is "project baseline" instead of Financial Budget.

Here's why:

Budgets are Fiscal Year based, and Estimates stand for the entire lifecycle of the project, customer, etc. And you get to list Products and Services, Noninventory items, and use Quantity on the Estimate.