Inventory in Books- our problem with pallets

Inventory in Books- our problem with pallets

We buy pallets full of products let us say 100 items on a pallet.
We then sell these items various ways-
Example
 customer pickup 
we batch them into 5,10, 15, 20 etc delivered and each quantity has a fixed price.

We would like to use the selling side to effect the inventory off the pallet.

I cannot think of a way of doing?

Is it possible even?