When you create a Site, the only available scope is the 'All' scope, which cannot be deleted.
You can create scopes using the procedure in this document. You can also create scopes when you create an administrator; each administrator must be associated with at least one role and scope pair. When you are creating or editing desktops, machine catalogs, applications, or hosts, you can add them to an existing scope; if you do not add them to a scope, they remain part of the 'All' scope.
Site creation cannot be scoped, nor can Delegated Administration objects (scopes and roles). However, objects you cannot scope are included in the 'All' scope. (Full Administrators always have the All scope.) Machines, power actions, desktops, and sessions are not directly scoped; administrators can be allocated permissions over these objects through the associated machine catalogs or Delivery Groups.
Scope names can contain up to 64 Unicode characters; they cannot include the following characters: \ (backslash), / (forward slash), ; (semicolon), : (colon), # (pound sign) , (comma), * (asterisk), ? (question mark), = (equal sign), < (left arrow), > (right arrow), | (pipe), [ ] (left or right bracket), ( ) (left or right parenthesis), " (quotation marks), and ' (apostrophe). Descriptions can contain up to 256 Unicode characters.
You can create a scope by copying an existing scope.
You cannot delete a scope if any administrator is using it.