SLA for Assets - how to configure Accumulated Depreciation & Depreciation Expense to use full Catego

I made it through Oracle DOC ID 465502.1 and managed to configure all the Additions event types to use the full category account. However, I am at a loss as to how to determine the link between the category accounts and the account derrivation rules to know which account derrivation rules have to be changed to affect the Accumulated Depreciation & Depreciation Expense.

Any help would be appreciated.

I am comfortable creating new 1) Account Derrivation Rules, 2) Journal Line Definitions 3) Application Accounting Definitions 4) and Subledger Accounting Methods, I just don't know which ones I need to modify!

Basically we want all the category segments of the category accounts to be pulled from the Asset Categories.