Why users are not able to see "Find Duplicate" button in Lead ?

Regardless of the entitlement model used, which page layouts might you want to customize?

Universal Containers uses Salesforce Knowledge and has defined its category groups based on the regions of Europe, of Americas, Africa, and Asi a. The administrator needs to restrict visibility of each category to the sales representatives within each region. How should the administrator control access to these category groups?

System admin wants to give "view all data" to users who have different profiles and differents roles ? how can he do this?

Universal containers is implementing a time recording system in salesforce.
Employees are required to record their time in a work log custom objectagainst either an opportunity or a case. The company wants to see total hours worked on an opportunity or a case. which type of relationship field should an administrator use to relate the work log to the opportunity or case?