Hello
As far as I know, this setting is only available at the material master and it is not possible to change is at BOM level.
You can try to use BAdI MD_CHANGE_MRP_DATA to control if the requiremens are assigned to the individual stock or not, from an MRP perspective. Please observer that this BAdI does not change data on the table.
However, BAdI WORKORDER_UPDATE can be used later to remove the assignment to the invidual stock from the production order components.
BR
Caetano
