Topdser has ''Basic Mapping'' and ''Advanced Mapping'', which can be used in these cases:
Find alternative suppliers for products that have gone out of stock
Connect a new supplier to your existing products
Merge different suppliers’ products into one Shopify product
Here is an in-depth guide for this:
Click Mapping to add an Supplier product link.
You can paste the original URL in the "Import" box.
Simply go to the AliExpress page of the product and copy the URL or copy the Topdser product URL if you use Topdser sourcing service.
Now paste it in the "Import" box, the product will appear, just click "Set". Then you can map the product's variants, and please make sure to match the original color and size. At last, you have to click" Save" once you are done.
If you want to merge different suppliers’ products into one Shopify product, you can click" Advanced Mapping".
Then you can paste the UPL in the box, which supplier you want and click "submit"
After you finish mapping for all variants, click "save".
Advanced mapping is done!