The endpoint policy editor may seem confusing at first, because the double-level editing may make it seem as if your server has billions of policies. In reality, the policy editing process is not that hard:
You create OS-level policies for the 4 OS groups (PC, Mac, Linux and Other)
You assign these to a top-level policy
You assign the top-level policy to an application and/or to a trunk
You can edit an existing policy, but the built-in policies are all built as a script (so you can only edit them in script-mode), which may be tricky for some administrators. It is very sensitive to syntax errors, so it's probably best to start with the GUI-based editor, and create a new policy. To do so, follow these steps:
Enter the endpoint policy editor by clicking Edit Endpoint Policies. This button is available in multiple places:
The Select Endpoint Policies page of the application publishing wizard
Through clicking on Configure next to Configure Trunk Settings on...