How to move Windows boot files to new drive?

I have an old PC which I have upgraded over the years.
It used to be a Vista / Win 7 PC which I then dual booted with Win 10 on a separate new HDD - and also Ubuntu on the Win 7 HDD - but the boot information has always remained on the original Win 7 HDD.
I recently fitted a SSD and cloned my Win 10 installation onto it. As I had a multiboot setup I simply added the new SSD as the default drive.
The problem came when I tried to remove the original Win 7 HDD. The PC simply stalled as it did not have any boot info.

How can I move / create reliable boot information on the new SSD?

I do not want to erase any of the existing HDDs - at least as yet.

Can you post a screenshot from disk management so we can see all details. It makes a difference if it's mrb,gpt, uefi

I have attached the computer management as JPG.

The main problem is that you installed Win 10 without detaching the other drives. Windows 10 is in more than one drive.

Try to detach drive 0 & 1 from the MB (detach SATA or power cable) leaving on only the drive 2 (SSD).
Then boot from win 10 installation disk and do a boot repair.

The installation DVD alone did not work at all.

I used Macrium Reflect to fix the MBR and boot files.

Good. Please mark this thread as solved.
As I wrote above, Drive 2 isn't complete.
I would do a clean install on it. Remember to detach the other drives from the MB.