If your product SKUs in Linnworks match marketplace SKUs, you could use the Link all by SKU option:
This is the quickest way to do it and would map all matching SKUs.
Otherwise, it can be done with an import so a file would need to be prepared with the mapping data and imported into the system. Stock Item Linking is the name of the import, you can find more details and an example file here - https://assets.linnworks.com/support/settings/import-and-export-data/import-data/import-types/stock-item-linking-import
Dear Support Center,
we have 2000 products listing and want to mapping on linnworks.If we mapping one by one manually so its very time taker work can you tell us how we mapping in bulk.