how to get the exact location of source "Salesperson Freight Account Line Level"

Hi All,

In couple of our SLA accounting rules we are having source as "Salesperson Freight Account Line Level" and "Salesperson Freight Account Header Level". Can someone please share the exact location of this source. I mean the navigation to get that source account.

I have gone through the Salesperson setup to get the location but we are not having any field related to the account segments/account string.