In order to assign Fee Type to Student(s), Please follow the steps mentioned below:
Go to Fee Management > Fee Types.
Click on three dotted icon, then "Assign Fee Type to Grade(s) Or Student(s)" displayed in Action column.
Click on Students tab.
Search for student's name and select the required student's record.
Click on Assign button.
Note: When a fee type is assigned to a student; then if a student has an open & unpaid invoice, then assigned fee type is added to the invoice. Otherwise, a new invoice will be generated.