Use type-to-tag to add tags for your product types.
Product types & tags
For some Shopify themes you need to add you product types as tags. This is very useful if you want to filter on producttypes within a certain collection. Opening all products and adding all the types can cost you hours and in some cases even days.
Type-to-Tag does it automatically in a few minutes.
You can get access for a month for $6.99 or a year for $69.99