Thank you for this. That helped. I did try to use the "cost" column but one of my superior told me that I should use "budget cost" and "budget work" As he is more experienced than me in msp. I worked my ass off to get his suggestions to work. Should have done i my way from the start.

One thing in the "cost" column I find odd is that when I add value to some of the tasks msp subtracts some small amount of the value and adds some small amount to others.

Some examples.
28.900.000 turns into 28.899.998


48.500.000 turns into 48.899.998
93.500.000 turns into 93.499.996
78.600.000 turns into 78.599.997

Any ideas?

As you have discovered, the budget cost and budget work field are "top down" estimates and can only be applied to the Project Summary task.

As you have more detailed estimated, I suggest adding the Fixed Cost field to the Gantt chart view and entering the values there. Then you can save a baseline after all planning is complete and have a "baseline" cost for comparison once you start tracking. The "baseline cost" is frequently referred to as the "budget".

Regarding the odd numbers - what version of Project and what service pack is applied?