Satish,
It is possible by disabling availability checking for deliveries. In many implementations it is not considered wise to do this, so caveat emptor. Test ALL business scenarios before moving to production.
Find the Item Category that is used for your deliveries (you can look at any delivery that has already been created). Then IMG > Logistics Execution > Shipping > Deliveries > Define Item Categories for Deliveries; select your Item Category; under the Quantity block, set "AvailCkOff" to "X"; save.
Best Regards,
DB49
