How to add multiple tracking numbers to one order/product - or an app that allows this

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We have products that consist of multiple parts. The "bundle" is listed as a single SKU but consists of multiple physical items, and we'd like to keep it that way.

We would like a way of adding multiple tracking numbers to the order and having the customer notified.

Please note the order is for ONE logical item, not multiple SKU/items but may be shipped in 3 satchels.

Any way of achieving this manually or an app that will allow this?