Overview
Budget Models define and act as the store for a specific, unique and referenceable sets of financial budget or financial forecast values.
Typical, example Budget Models could be …
FY2021 FY21 Financial Budget
FY2021Q1 FY21 Financial Forecast, Q1 (Period 3+9)
FY2021Q2 FY21 Financial Forecast, Q2 (Period 6+6)

Please provide a list of the financial budget and forecast values that you would expect to create, maintain and report upon within any one financial year.
Further Reading
Further information on defining Budget Models and Basic Budgeting Configuration is available via the following URL’s
Budgeting overview – Finance | Dynamics 365 | Microsoft Docs