@myatix,
Mapping based on categories:
You can map your WooCommerce categories to Google’s categories like this:
https://www.dropbox.com/s/hd5775sg21bq4go/Screen%20Shot%202017-08-23%20at%2008.41.22.png?dl=0
In the above example I am mapping my WooCommerce shop category ‘Animal’ to one of the Google categories (it does suggestions as you can see when you start typing in the field).
Mapping based on product name:
You can map to Google’s categories based on your product names (or parts of it), like this:
https://www.dropbox.com/s/bc6s6hg63gxnys2/Screen%20Shot%202017-08-23%20at%2008.45.03.png?dl=0
In the above example I am mapping all products that have ‘strawberry’ in the product name to a Google category.
Map all products to one Google category:
Or you can map all your products to one Google category like this:
https://www.dropbox.com/s/vug2ele2g32jm64/Screen%20Shot%202017-08-23%20at%2008.47.05.png?dl=0
In the above example I am about to map all my products to the Google ‘Alarm clocks’ category.
Hope this answers your question?
All the best,
Joris