With the current Beta the mapping of subkeys on disk to keys on card is not really possible.
(The screenshots are for a simple key, imagine one with a lot of subkeys.)

Key only stored on Smart card:

Same key after import of secret key backup:

and on the smart card tab, card disconnected:

Proposal:

In main area of Details Window:
Change "Secret key" location info to "on this computer and on smartcard(s)" and leave the smart card identifier off in this place. (It can be found in the smartcard tab.)

For Smartcard Tab:

• Add Fingerprint column
• Make Keygrip column default hidden

For Subkey Tab:

• Make Fingerprint column default
• Make Key-ID column hidden
• Add hidden keygrip column