Suggest add a few more fields for credit card entry
1. billing address. for corporate credit card, it's better to have billing address recorded, coz' it's generally different with personal ones, which some times it's not easy to remember.
2. online banking url, username and password.
To answer your questions;
1. You can use our custom fields in the information tab to add specific values such as billing address;
2. You can add different tabs to the data entry as well. In your case, you would like to have an online banking url, a username and a password so you would add the tab Login (Web);