# Catalog editing

3 operations.

Changing what you sell — the details of styles, products, variants and their identifiers.

## Operations

| Operation | Kind | What it does |
| --- | --- | --- |
| [assignIdentifier](/reference/catalog-editing/assignIdentifier/) | mutation | Assign an identifier (a barcode, a UPC/EAN/SKU) to a variant. |
| [retireIdentifier](/reference/catalog-editing/retireIdentifier/) | mutation | Retire an identifier from a variant — it stops resolving. |
| [voidIdentifierEntry](/reference/catalog-editing/voidIdentifierEntry/) | mutation | Void an identifier assignment made in error — the honest correction of a mistaken assignment. |