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Fix missing Handle values in Shopify CSV

Shopify uses `Handle` to group product and variant rows. If Handle is blank, import may fail or create fragmented products.

Before and after example

Handle,Title,Variant SKU
,Classic Tee,TEE-BLK-S

Handle,Title,Variant SKU
classic-tee,Classic Tee,TEE-BLK-S

1. 1. Fill Handle for each product row.
2. 2. Keep the same Handle across variant rows of one product.
3. 3. Use lowercase slug-like text without spaces where possible.

Why this fails in Shopify

Missing handles break the product grouping logic used during import, so variants cannot reliably attach to the intended parent product.

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