Not quite it, but thanks GeneralDisarray.
I have modified the attachment to show the result I am looking for.
The purpose of the formula is to automatically track the "Action ID" numbers assigned to items.
e.g. Pumps are a problem(Item) - I assign actions to fix the item (A01, A02). When the actions have been entered into the Action Register they automatically appear in the Item Register (as shown in the attachment). So one item may have many actions assigned to it, this is just a way of tracking them.
I hope that makes sense.
Thanks.
HSE Register2.xlsx
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