Custom Serial numbers in Inventory tied to customers

Custom Serial numbers in Inventory tied to customers

Hello, We have both software and hardware serial numbers that we need to track for active customers in the field.  We do not know the serial numbers for the software until the customer buys it as its not a stock item but something we order and deploy for our customer in a SaaS model.  Can someone please provide some guidance on how best to set this up in inventory?

Thank you!