Kindly download template from your seller dashboard. Open that file, you will notice 3 sheets as mentioned below:
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PRODUCT FEED
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SUMMARY SHEET
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EXAMPLE SHEET
Click on SUMMARY SHEET. The PRODUCT SUB-TYPE which are mentioned in that summary sheet, you have to choose among them as your product sub-type and update. Kindly be cautious, because, minor spelling mistakes are also not accepted by the system.