Hi Ashish,
In simple the hierarchy is as below
Maintenance Plan
Maintenance Item
Object List
Maintenance Plan can have multiple Maintenance items. When you create multiple items and schedule the maintenance plan, order will be generated for each item. Each maintenance item will have one equipment in the header.
In case if you assign object list (2 Equipment) in the maintenance item (1 Equipment header), on scheduling the maintenance plan, system schedule the maintenance item and create the order, system will not generate different orders for different object list. You can see the object list equipment in the maintenance order under object list tab. Also cost will be calculated based on the header equipment, you cannot separately calculate the cost / labor of the object list equipment
Regards
Terence