CRM - Configuration of billing plans

Hi ,

Our client will always the orders in CRM , from CRM the order will get replicated to r/3 and from there the delivery , billing and accounting posting processed in R/3 , sales and distribution.

Now we have a scenario where the for the line item we have to configure milestone billing plan so that the same should get replicated in r/3.

Can any one please suggest the configuration steps in CRM.

thanks

Gopalkrisnhna