You can add hours to be used for the project in the project's basic information.
NB! The hours budgeted to the project tasks are dominant. This means that the hours assigned to tasks within the project run down the hours fed in to the project's basic information.
How to assign hours to a project
Set resourced hours and hour estimate in the project's basic information
Go to the project and click Edit under its name.
Write down the hours available to use in the Budgeted hours field.
Budgeted hours in the project listing