Dual boot => Triple boot [duplicate]

A 256GB SSD has Windows-10 and 16.04 installed. BIOS not UEFI. A charity I work with requires me to use Quickbooks Desktop on Windows. The plan is to ghost the existing system to a 512GB or larger SSD and create a third bootable Windows 7 partition for performing charity activities.

• Is this possible to have a third partition?
• Is there a good example you have used as a guide?
• Is triple booting with two Windows partitions different from 2 Linux partitions?

If you have done this before (3 bootable partitions with GRUB) please indicate this in your response: lessons-learned are appreciated. Thank you

Yes, that's possible. I've had at least 5 operating system in parallel, at a time.

If you install Windows, it will not care about existing Linux installations. It will make your PC only boot Windows.

But fear not! You can boot into a live session, chroot into your existing Ubuntu installation, and update grub: How do I run update-grub from a LiveCD? This will make your PC boot all installed operating systems, again.

Because you intend to use more than one hard drive: Make sure to have your bios boot from the hard drive your Ubuntu installation is on with higher priority (further up) than the other hard drive.