Default Products for Child Item

Hi all,

We are currently developing Ordering via Web. We are able to add Promotion, Root Products along with the default products.

We are inserting the Product in the Order Entry - Line Item BC and we are calling Apply Promotion in case of promotion and Load-Sync Instance in case of Root Product.

But we are facing issue while adding Child Product which is a customizable product.

The product structure :

Root Product

|_ Child 1(Optional Product Def Cardinality = null/0)

      |_ GrandChild1 (Default product of Child 1)

When I try to add Child 1 , the CrandChild1 product is not getting added automatically.

Kindly let us know, how to bundle the child product.