You have the ability to create different fee types and assign them to the grade or students. Please follow below mentioned steps to create Fee types in Muntazim.
Go to Fee Management > Fee Types.
Click on 'Add New Fee Type' button.
Enter Fee Type name.
Enter details as per your requirement.
Select Status as 'Active'.
Note: Periodic = NO means that only one invoice will be generated for this fee type.
NOTE: You can also refer How to add fee type (periodic/recurring)