Add custom fields in "table format"

[soverho]

Hi,
is it possible to add a custom field in table format with the possibility to add other rows during asset editing?
For example, for an asset (like a pc/server or a software) I would to add the credentials to login (username and password) otherwise the ip address with subnet mask and gateway: in this case if I'm adding a network device like a switch/firewall, can I have multiple IP for different port.
How can I manage these cases?