It is possible to manage different artists on the same La Cupula Music account. Every time you create a new release with a different artist, it will be automatically added to the list of artists on your account. You can access the artists section by going to Catalog > Artists.
You can also add directly new artists directly on the Artists section. From there, you select and edit the information for each artist.
You need to keep in mind that all royalties will be paid to only one account. Once the payment has been done, you should divide the royalties manually between the different artists you manage (the information on what artist generated what amount is available at the platform). You can find more information on this link.