Subtotal of detail in table by one of the elements

For every change in School District and Local Use, subtotal the Grant_Var field. I know how to do this in excel, but want to know if I can do it in Access. The fields in the table are SU#, School District, Local Use, Grant_Var. All by Grant_Var are Text fields and Grant_Var is a currency field. For a distinct SU#, School District, Local Use combination, there can be as many as for lines of Grant_Var and I need to subtotal that Grant_Var for a report. I am fairly new to Access, and am building a new report from an older one that had periodic data. I have four quarters of data combined. I am including an excel spreadsheet with the data from the table. Any suggestions?