linking attributes

We currently have an item attribute that we are going to use for assigning modifiers.  We have completed the setups for the new item category and now we need to complete the attribute linking.  We have attempted to set up the attribute mapping but when we are linking it is required you link Order Capture, Advanced Pricing, Contracts Core, and Service Contracts.  My question is how is the header level and line level information derived?  Such as Global Object Name, User Source Type, and User Value String.

Thanks you,

SLM