Business Object Extension TO Standard BO, Namespace and BO correct choice?

Hi,

I want to extend custom field to several standard BO,

but some Standard BO I don't know what the object is to be selected

1、Customer → Accounts

Namespace: http://sap.com/xi/AP/FO/BusinessPartner/Global

Business Object: Customer

Extend success!! (COD_Account_TI & COD_Account_QC)

2、Activities → Appointments

NameSpace: http://sap.com/xi/AP/PC/ActivityManagement/Global

Business Object: Activity

Extend success!! (COD_Appointment.TI & CON_Appointment.QC)

3、Activities → Tasks

NameSpace: http://sap.com/xi/AP/FO/Activity/Global

Business Object: ActivityTask

No TI、QC、QV Screen, iis it right or not??

4、Sales → Sales Leads

NameSpace:

Business Object:
not found similar

5、Sales → Leads

NameSpace: http://sap.com/xi/AP/CRM/Global

Business Object: Lead

No common node, is it right or not??

6、Sales → Opportunities

NameSpace: http://sap.com/xi/AP/CRM/Global

Business Object: Opportunity

is it right or not??

7、Sales → Sales Quotes

NameSpace: http://sap.com/xi/AP/

Business Object:

is it right or not??

8、Sales → Sales Orders

NameSpace: http://sap.com/xi/AP/

Business Object:

is it right or not??