We order 60 Chairs from Suppliers each given time,  and it takes two months to arrive to our warehouses, we deliver the Chairs on a specific day, e.g. First Day of each Month. 

I want to show on my website 2 offers:

1-Chair for 50usd to be picked up from store, linked and limited to quantity to our warehouse.

2-Chair for 30usd to be picked up from store at Jul 1, linked and quantity limited to our "order-shipped warehouse Jul 1" , it is for those customers that would take a discount but wait long for the product to arrive. 

3-Chair for 30usd to be picked up from store at Aug 1, linked and quantity limited to our "order-shipped warehouse Aug 1" , it is for those customers that would take a discount but wait long for the product to arrive, and especially when "Jul 1 order" is already reserved and sold.

once my batch of Chairs arrive, I move the stock from "order-shipped" warehouse to the real warehouse.

This would make me have 1 ean13 code for all, one internal reference "or could have different based on arrival date", 

In the webshop, I would have different descriptions to show customer arrival date.