Hi,

In Odoo, licenses are typically based on the number of users that will be using the software. Therefore, your client will only need licenses for the 200 managerial staff who will be using the HR and Finance modules.

In your client's case, the 5000 employees would likely be considered portal users, as they will only need to access a limited set of features within the HR and Finance modules (such as applying for leaves, checking leave status, etc.). Portal users are typically not required to have a license, as they have limited access to the system.

Therefore, your client would only need to purchase licenses for the 200 managerial staff who will have full access to the HR and Finance modules.

Regards