The category field will set the product from category to subcategory as well. 

Map the category field to the matching column in the feed, if there are three columns in the feed file. Then, mapped it accordingly as this Cat1>>Cat2>>Cat3 (refer to the example above) 

So from the example, Men will be the main category and Clothes under the main category while T-Shirt under the subcategory of Clothes. When need the subcategory in the category field can use this field and map it accordingly. 

If the products in the store has a different category name compared to in the feed. It can use this feature to Find and Match.

For example, in the store category is computer but the inventory feed category value is pc.

Enter pc in the Find in feed

And enter computer in the Match with store.

Stock Sync will match accordingly. It also able to add multiple find and match separated by comma.