In MTO scenario i want to have some materials with out account assignment

Hi,

In MTO scenario i want to have some components in my BOM to not to get planned with respect to sales order stock / account assignment of specifice sales order( say "C" class items). if i use Consumption based planning" VB" for those

materials it works with manual reorder point planning.but i cannot estimate my correct reorder point for that material.because it is not constant requirement .It varies basing on customer sales order for that period.

My question is how to plan these components in MTO scenario with out having idea of correct manual reorder point for those materials.

thanks in advance

regards

madan