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# makePart(for:)

Creates data for the part with the given identifier.

```
func makePart(for partID: AssignableDocument.PartID) throws -> MergeablePartData?
```

## Parameters

`partID`

The identifier for the part you want to create.

## Return Value

Part data for the `partID` provided, if possible. Otherwise, `nil`.

## Discussion

In cases where this document is a partial one, i.e. it is
missing some parts, you use this method to create
data for the missing part. You then use [`merge(partData:into:)`](/documentation/Assignables/AssignableDocument/merge(partData:into:))
to merge the newly created data into this document.

---

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