Need help with diagram (class, attributes, methods)

Class : Staff

Class : Sales Performance(Whole)

Class : Sales Performance(Teams)

Class : Sales Performance(Individual)

Class : Maintenance

Class : Sales Goals

attributes and methods

car dealership with 50 cars

"The sales team will monitor and record sales performance, both for the company and for individual sales professionals and teams. The sales operations team may also develop the sales metrics that the sales team must achieve, along with calculating how much compensation a sales professional receives for different sales activities.

The sales team is the main end user of the application, but, at the end, you will develop a GUI for customers.

The sales team has five (5) sales people and a manager. The dealership has an inventory of 50 cars. The sales team needs to interface with the dealership's maintenance department, which will keep track of what cars are mechanically available for sales."