Hello Rosey,

If you want to make 5 quantity package then we can assign it one lot number for specific package.

And If you can create another package for 100 quantity then you can write the description this package contain 5 boxes and each boxes have 20 quantity and this package have specific lot number which you can scan.

So, By scanning the package you have get idea this package contain 5 box and each box have 20 quantity. But, You can not assign lot number to specific product.

Openerp v7.0 In product view there is one sale tab view in this tab you can see package options. So, you can create package of quantity.

And, When you deliver the product then there is in 'Deliver Product' view one serial number functionality are there and you can create a serial number for specific production lot.

Thanks, Serpent Consulting Services Pvt. Ltd.