From Setup, in the Quick Find box, enter Account Settings and then click Account Settings. Select Show View Hierarchy link on account pages in Salesforce Classic. Whenever an account is related to another account via the Parent Account field, the account detail page includes a View Hierarchy link.
Set Up Account Hierarchy in Salesforce Classic
help.salesforce.com > apex > HTViewHelpDoc > id=sf.account_hierarchy_s...
Click CEO, and on the CEO role detail page, click Assign Users to Role. In the Available Users drop-down list, select All Unassigned. Choose a user from the list, and click Add to move her to the Selected Users for CEO list, then save.
Create a Role Hierarchy Unit | Salesforce Trailhead
trailhead.salesforce.com > modules > data_security > data_security_roles
To view detailed information about a role, from Setup, in the Quick Find box, enter Roles , then select Roles, and click the role name. In the Role Detail related list: To view the role detail page for a parent or sibling role, click the role name in the Hierarchy or Siblings list.
Viewing and Editing Roles - Salesforce Help
help.salesforce.com > apex > HTViewHelpDoc > id=sf.users_role_view.htm
From the setup menu, search for the quick find box and open “Roles”. Just below the name of the company, click on the button “Add Role”. Inside of the label box type “CEO” In the “this role Report to” badge, click on the lookup icon and then click on the “select” just next to the Org.
Role Hierarchy In Salesforce - Create & Edit Roles - DataFlair
data-flair.training > DataFlair > Salesforce Tutorials