bulkImport of products that should not delete it's SKU

Summary:

Hello Team,

We've requirement, where the we're integrating the PDH(product data hub) with the commerce platform.

For this we're using the bulkImport API for importing products and it's skus.

We've below issues during this

1. During initial Upload if it is a new product, will upload all the it's features, and skus
2. We've the structure where one product can have multiple SKUs based on the variant.
3. There are couple of fields which specific to the SKU in commerce as well as in PDH.
4. When a SKU is updated, during the import we only get the information that particular SKU, but not sibling SKUs