Two apple IDs on one device

Hi Eric,

I'd like to put the question to you in another way.

My partner and I each have our own apple ID. Can we each have a sign-in on the same device (iMac) enabling us to see our own information, data and files by using our individual Apple IDs?

You can do that by creating a second user account on the iMac. Then each of you can sign into your own Apple ID in your separate user account.

User Account – Add New Admin.    -

User Account – Add New Admin In Single User Mode.  -

User account add  -

User account add (2). -

Devices are meant to be used with one ID. You can sign one ID into the App Store/iTunes and another ID into iCloud, but you can't sign two IDs into one place, for example iCloud, at the same time.