When you assign a component to a NWA you specify the Procurement Type which controls how the system reacts to this component. It can create a reservation, PR, etc.In configuration the Procurement Type is created in OPS8, it's under Project System, M...
In the Budget Profile you define what currency is the entry currency and then all other currencies are calculated from that value. In the Budget Profile you can set the entry currency as CO Area, Object, or Transaction.