How can I import images as a group

Greetings!

I'd like to know if it is possible to import images to Unity as "groups". To explain better what I mean, here:



Inside the black square you can see a bunch of card pictures. The way I got them this way was by using the Sprite Editor > Slice feature on the original image (the very first one, to the left of the red circle and that I got from the internet) and then drag the original image (so the whole group) into the Sprite field in the green rectangle to the right. However, I need to import different pictures but I can't get them to be imported in a way that would look just like the first picture. Here's a screenshot of what I'm seeing right now with the other pictures I need:



As you can see, inside the black rectangle (and the ones outsides), are all the pictures I need to be imported inside one whole group, but as I import them, they're all presented that way and each one is a group of its own picture (as you can tell by the red circles). I thought of merging all the pictures together into a grid and then using the Sprite Editor to slice them, but they're way too many to do that. So I'd like to know if there's anyway to import them into a group (not a folder, something that looks exactly like the first screenshot) so I could then put them as a whole into the Sprite field (the one in the green rectangle) just like I did with the normal cards.

Thank you in advance,
- Nervly

 

Thank you for your reply! I'm sorry for the late answer, but I haven't had internet for the past couple weeks.

I did as you suggested and I got to this:


Is there anyway I can put this packed sprite into the Sprite Editor so I can then use the Slice function to separate all the cards?

Thank you!