To consolidate all your departments AND projects to the organisation budget:
Add an Unlinked Department and call it something like Consolidated Projects
In the Consolidated Projects budget, select all columns and add a formula
Make the formula live in the top right and then apply it
In the data source after the Budget version, select Projects
Using Bulk Actions, select them all
To enter your calculation, in the left side choose Selected Accounts
You do not need any further calculation
Apply Formula
Select the Organisation
Click Consolidate and then Consolidate all Departments