Customize the Employee form - Zoho People

Customize the Employee form - Zoho People

Hi,
I am working on trial version of zoho one, I am trying to customize the employee form in zoho people but unable to remove/customize few fields. for example, I don't want few fields like Nick name, Seating location etc.,  and also customize few fields like 'Reporting To' currently accepts only one value but I want to change it to multi-select. is there any restriction which doesn't allow me? or am I missing anything?. could you please help here.

Thanks,
Bharath