How would you manage forward contracts in Zoho Inventory?

How would you manage forward contracts in Zoho Inventory?

Hi there,

We are a distribution business, selling our products on the spot market as well as through forward contracts. 

A customer might want to sign a contract for 500kg at £11/kg over 12 months.

How would you track this to stay organised and make sure you have enough inventory to honour the contracts?

At the moment we have 2 warehouse in Zoho. Ideally I would have 1 warehouse for each contract, but the costs of adding more warehouses is too high.