When using Standard Costs, for things like 'Contract Manufacturing Labor', 'Contract Manufacturing Materials', 'Direct Labor', and 'Manufacturing Overhead' - to properly have these included in the cost roll-up, I need to add them to the BOM. How should I best do this? I'm a bit confused by: Other Item for Purchase Non-Inventory Item for Purchase Service for Purchase And then also the 'mark as receivable' indicator and how that relates to variances