Tax Applicability Query

 Hi Folks,

We have done all setup steps as follow.

1. Defined Tax Authority

2. Tax regime

3. Tax

4. Statuses

5. Jurisdiction

6.Rate

7. Detiremining Factor sets

8. Condion sets

9. Recovery Rate

now reviewing the "Update Configuration Owner Tax Options:" the following check boxes are disabled

i.e 1. Allow Tax Applicability

2. Allow Override for Calculated Tax Lines

3. Tax Line Override Impacts Other Tax Lines

4.

Allow Override and Entry of Inclusive Tax Lines

5. Enforce Tax from Account

 could some one explain bit detail about these setups,

note:- our Tax configurator owner is Operating unit, is it necessary to enable check box " use subscription of the legal entity " check box if yes why it is required please explain.