@Tut think manufacturing orders sounds more like what the OP is doing personally. At least ways that is the impression I am getting. I have not used the manufacturing orders module as I don’t manufacture things - I may sometimes sell an inventory kit but thats another thing.
What exactly are you selling @anoopchintu ? If you are manufacturing something from different materials use the manufacturing orders. If you are selling a kit of one or more items from the inventory, then use inventory and inventory kits, if you are just plain buying and selling goods, then use inventory. If you are using materials on a job and using labour on a job that you have not quoted every item for, then disbursements would be useful.