Once you have added an objective to the improvement plan, and an activity underneath the objective.
Find the objective, select the activity's edit pencil
Once selected, find the resources tab.
Select 'Click here to add a new item'.
Add a description, once clicked off you will be able to add the rest of the details.
From the drop down select the required funding type (see linked guides on how to add a funding type).
From the drop down select the required cost code (see linked guides on how to add a cost code).
In the next column add what the budget is for the activity.
Once you have had time to calculate the actual expense you can come back and add it into the actual column and then add the difference to the next column.