Epicor 9.05 Cost Accounting Workbench

I need to know how where the cost are pulling from when costs are rolled.

 

Our costs are stored in a master list. I was testing a cost rollup for a manufactured part.

 

I used Cost Adjustment to change the cost of the raw material to $5 (from $3).

 

When I loaded the cost workbench, the $3 was there. When I rolled and ran the cost edit list, the raw material cost showed the "old cost" as $5 and the "new cost" as $3.

 

Can anyone point me to some user guides that will help me understand Epicor layout and configuration?

 

Thanks -

 

Susan