Protected share with some subfolders shared and others private

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX4
1

Is it possible to set up a share

project docs
finance

where some users of the project share have access to the finance share but not all users?

2

The answer to your SUBJECT question is NO.
The answer to your CONTENT question is YES.

Subfolders can’t carry unique permissions.
Shares can.