Budgets can only be uploaded at subsidiary level, not directly to the parent company.

To upload a consolidated budget, choose a subsidiary in the same currency as the parent and upload there, then report at consolidated level.

See How to add a budget or forecast. 

Once one or more budgets have been uploaded at subsidiary level, go to Load Data (top bar)>Budgets & Forecasts (left sidebar) > use dropdown menus by entity to select budget from each entity> name the consolidated budget (top left of selected budget section).

Once created and named, these budgets are available for use in all Reports, Dashboard charts and graphs, and Presentations.

Hint: Manual entry budgets will have a report logo whereas those uploaded from your accounting system will have the logo of the accounting system next to them.