for Query 1:
Argument 1 : Org_id refers to the id of the operating unit. (hr_operating_units) here 110 in your case.
Argument 2 : you are passing ALL_ORG as 1. So it processed both the master (108) and child org (123) organization_id of the inventory organization (in mtl_parameters table)
while running item import if you pass PROCESS_SET_ID it will pick those records. if not it will pick all the records.