Add a third address at checkout

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I'm developing a store for a client who's business involves sometimes shipping things to an intermediary address before the final destination. They would like to add an optional third address that would represent the final destination, they do not need to use this address to create shipping labels through Shopify but they do need it for their records and to create a UPS pickup later on.  Is this possible with an app, I haven't been able to find anything on this.