Dear Aditya
Agreed with Sir Jürgen L, Components will not be shown while doing 101 for the main Material in subcontracting, You can only Issue material while doing transfer posting either via MB1B or ME2O from storage location and thus make the component as special stock, although you see stock in that storage location but under the head “Stock provided to vendor”.Upon GR, it will be consumed automatically form the stock "Stock provided to vendor"
Best Regards,
Mohsin Abbasi