How do I create a Pivot Table chart Slicer that drills down from 'Cohort' to 'Class 1' and 'Class 2'?

Question

Basically, I want a single slicer that when selected, will show student data based on the selection.

Individually selected, either - Cohort, Class 1 or Class 2: Single line line chart with the assessment grade.

Multi selection - Class 1 + Class 2, Cohort + Class 1, Cohort + Class 2, Cohort + Class 1 + Class 2: Double/triple line line chart with the assessment grade for a visual comparison.

Pic of sample data

Sample data:

Student ID	Class	Assessment 1	Assessment 2	Assessment 3	Assessment 4	Cohort
1000	Class 1	60	70	80	40	Cohort
1001	Class 1	65	75	64	45	Cohort
1002	Class 1	67	56	86	86	Cohort
1003	Class 1	48	58	84	48	Cohort
1004	Class 1	56	85	68	84	Cohort
1005	Class 1	67	86	48	48	Cohort
1006	Class 1	84	86	68	84	Cohort
1007	Class 1	67	56	48	48	Cohort
1008	Class 1	48	58	68	98	Cohort
1009	Class 1	56	85	70	80	Cohort
1010	Class 2	67	86	75	64	Cohort
1011	Class 2	85	68	56	86	Cohort
1012	Class 2	70	80	70	80	Cohort
1013	Class 2	75	64	75	64	Cohort
1014	Class 2	56	86	56	86	Cohort
1015	Class 2	58	84	58	84	Cohort
1016	Class 2	85	68	85	68	Cohort
1017	Class 2	86	68	84	63	Cohort
1018	Class 2	56	48	48	74	Cohort
1019	Class 2	58	68	98	65	Cohort

Thank you

I think the answer may lie in power pivot, but I'm still relatively new and unsure of what to do.