oe_order_pub.process_order API for model items

Dear Friends,

I have a requirement to create a sales order for a model item using oe_order_pub.process_order API.

I have a model in the following structure.

TM

    OC1

          O11

          O12

    OC2

          O21

          OC22

                OC221

                OC222

I understand that we need to pass values to top_model_line_index and link_to_line_index columns in line_rec_type for Model items.

But i am not clear and what values to be passed for these 2 columns for each item in the BOM.

As per the note 1575371.1, The 'link_to_line_ref' and 'link_to_line_index ' of the option item will be same as of its corresponding option class.