Adding Project Costs to a Contributing Cost Report 
The Costs page appears only if enabled in the project type.
To add costs and resources to an event, do the following:
On the Costs page, choose Edit for the event to which to add costs and resources.
On the Settings page, fill in the fields under Cost.
Save your entries.
Note
You can also add costs and resources in the Cost view for the Schedule page.
You can edit cost and resource information after adding it.