A salesperson may manage many other salespeople
A salesperson is managed by only one (or none?) salespeople.
A salesperson can be an agent for many customers.
A customer is managed by one salespeople.
A customer can place many orders.
An order can be placed by one customer.
An order lists many inventory items.
An inventory item may be listed on many orders.
An inventory item is assembled from many parts.
A part may be assembled into many inventory items.
An inventory item is assembled from many parts by many employees.
An employee assembles
A supplier supplies many parts.
A part may be supplied by many suppliers.