Unless you provide details of your system specification, I can't answer you.
The Hard Disk Boot Priority for a personal can usually be configured so that your PC boots up from devices such as a hard disk (e.g an SSD), an opitical drive (such as a CD or DVD-RW Drive) or memory stick. If you have a PC, it should automatically detect one or more of these devices ("plug and play").
When you mention "Bootable Add-in Cards", I suspect that you are trying to get a server to boot up. Is that what you are trying to do?