This article will walk you through the process of creating a field on the Account object which allows you to sort customers by region.  

Navigate to Setup

Filter on the word "Account" then click Fields

Click "New" on the Custom Fields subsection.

Choosing Field Type

Choosing Field Type

Select Formula as the Field Type

Choose Text as the return type and label the section as you deem appropriate.

Creating Advanced Formula

Creating Advanced Formula

Numer 1:  The name of the profile that is assigned to the CSM

Number 2:  The name of the region you want to create

Note:  You can do multiple profiles per region by doing this:  CASE ("System Administrator" , "West Coast" ,  "CSM" , "West West Coast" , "Admin User" , "East Coast" , "Standard User" , "East Coast"  )

Choose visibility on this screen for who can see the field.

New Account Field

New Account Field

In this example, because the account owner is Scott Morris and he falls under the System Administrator profile, the East Coast region is assigned to the account.

Setting Up Customer View By Region

Setting Up Customer View By Region

UI View

UI View