"Add to card" questions

I have Main gallery with 2 sub-albums , in those 2 sub-albums i have many more pictures. Then, i want guests can only "Add to cart" the pictures inside each sub-album , not add the whole sub-album to cart . Is it possible ?

P/s : I have figured it out :D . First i edit permission for the whole album (Everybody can add to cart the whole album) . Second, i remove the permission for just the album not the pictures inside by unsticking "Apply changes ..."