Hello Yvonne,
1.Regarding your question on Location , I would suggest you to go through Help Center Document name : Services .
=>It have complete details on it .
2.Regarding your question on 2 different Service Confirmation ,yes it is require(depend on business case) .
Let me explain you with another Use Case .
=>Let say there is Service Order ->Item '10' (which is reference to Contract Item ) and Service Order ->Item '20' (which you add manually within service order item level) .
Result : In the Service Confirmation created ,the Item '10' and '20' belongs to 2 different reference/source (One is reference to Contract Item and 2nd reference to Service Order I
===> So, it require 2 different Service Confirmation to be created .
Hope this help.
Regards,
Ankush.