How to Apply an existing Modifier On Order Header Level?

Hi,

How to Apply an existing Modifier On Order Header Level Using order import ?

Now I have created order, using oe_headers_iface_all& oe_lines_iface_all and using order import. Here I want to apply existing modifier to the order,Please suggest.

I also tried to load the data into this table oe_price_adjs_iface_all before running order import program , I don't see any changes? (  Is it correct approach ?)

But whatever modifier is there in system got applied on order as it is.

Note:-  Can we apply modifier after creation of order /while creation of an order will apply ? At What Point I should Apply. Please explain with One scenario.