Confusion about Dynamics CRM bundle product

Hi,

I need some help regarding Dynamics CRM Product Catalog. We have 4 products:

1-      Configure / Install Product ABC

2-      Configure / Install Product XYX

3-      One-time setup fee.

4-      Ontime fee for Configure / Install Product, applicable on Product 1 and 2.

We want to add Product 4 automatically if user adds Product1 or Product2. I tried creating two bundles like:

a-       Bundle one (Product 1 + Product 4)

b-      Bundle one (Product 2 + Product 4)

And then I have added all these Products 1,2,3,4,a and b to the same price list. I have set 0 amount for the bundle products.

When user adds Product 1 to the Opportunity, CRM automatically adds two products which are Product 1 , 4 and Bundle a.

And here is the screen shot of the issue:

Is this a good approach? Do we have a better approach?

Thanks