How to design a role to get the access to a specific task

Summary:

Content (required):

When I try to design a role to get the access to a specific task, it is showing all the other task as well. Can you please suggest how to achieve this?

Requirement:

Need to get access on the below specific task

Navigate > My enterprise > Setup and Maintenance > select Accounting hub > Functional area : Accounting Transformation > Manage Mapping set

Created a role with below privilege's:

Manage Subledger Mapping Set

Manage Subledger Mapping Set Value

Setup and Maintain Applications

Review Applications Offering

Execute Setup Tasks

But this role is showing all the other task's in Setup and maintenance. 

Version (include the version you are using, if applicable):