Advice on ASUS-X99-All

I recently had an ASUS x99 AII built for me that has Windows 10 installed as the O/S on a Solid State Drive.
I need to Dual boot with Windows 7 Ultimate in order to be able to run some Legacy Software.
I want to load this on an internal Toshiba 6 Tb Hard Disk already installed and formatted.

Not being very well trained in this kind of thing I have spent quite a few odd hours over nearly 2 weeks attempting to do this Operation.
I think my problem is a lack of understanding of the UEFI settings.
I have Windows 7 setup on both a BOOTABLE USB and a DVD.

Could someone please take me Step by Step through the procedure.

Thanks

Mike
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