There is a good way and a bad way to add products to a category in your store. The good way is by creating 'search subscriptions'.  The bad way is adding products one by one to a category.

Datafeedr enables you to 'subscribe' to a search.  Every 'search subscription' is linked to a category in your store.  For example:

1. I have a category named "Shoes for Rock Climbing".
2. I do a search for "rock climbing shoes".
3. The search for "rock climbing shoes" returns 100 results.
4. I save this search to my "Shoes for Rock Climbing" category.
5. Now my category has 100 products in it.

What's so "good" about this method?

While it might take a little more time to set up a search subscription which returns the products you want, the time it saves you in the future is well worth it!  Here are the advantages of taking the time to set-up a good search subscription:

1. New products are automatically added - If a merchant adds new products to their inventory and those products match your search subscription, those new products will automatically appear in your store.
2. Add dozens/hundreds of products in 1 click - With search subscriptions, you can easily create a store filled with hundreds of products with just a few mouse clicks.  There's no need to select every single product, one by one, to be included in your store.
3. No need to check inventory - You don't need to constantly search the Datafeedr database looking for new products that may have been added since the last time you checked.  That happens automatically with search subscriptions.

If you find yourself adding more than a dozen products one by one, you are probably a candidate for using search subscriptions.