Entering budget on parent account

Is it possible to set budget on parent account?

Condition as follows:
Parent: Travel Expenses
Child: Hotel, Airfare, Allowances

We want to track budget on total travel expense only, child accounts are allowed over budget as long as total travel expenses is still under

Currently, ERPNext only supports setting of budget per child account. Please refer to this:

https://frappe.github.io/erpnext/user/manual/en/accounts/budgeting

Thanks!