How to install two Windows OS's in same PC?

Thanks, everything is more than clear now, this is what I'll do:
1) backup Windows 10 (even if not necessary, it never hurts doing so)
2) clean install Win11 in disk 1 without changing current boot menu

Most probably everything will be fine, but worst case scenario that Win10 is lost from boot, I can follow Navy's bootcd fix

Will report back with the results, thanks

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UPDATE:
So after backing up my Win10 partition I installed Win11 in Disk 1 without changing the dual boot settings. No issues whatsoever except that after installation, Win11 ended up as default OS in the dual boot but that was an easy fix by setting Win10 as default in msconfig within Win10. Also as suggested by Navy, I disabled fast startup in Win11.
One thing that puzzled me is that when installing Win11 when prompted to select which disk to install onto, the partition map showed a small 16MB MSR partition which in disk 1 in Disk Management (as seen in my previous post screenshot) did not show up (it only showed a single full partition). I deleted this small partition and Win11 install displayed a warning that it contained device info, but I went ahead and deleted anyway to end up with a single deleted partition in Disk1 where I installed Win11

You need to give Windows 10 Home a drive letter, let's say T: . Then the command would be:
bcdboot T:\Windows /addlast /d

NavyLCDR said:

You need to give Windows 10 Home a drive letter, let's say T: . Then the command would be:
bcdboot T:\Windows /addlast /d

Thanks Navy, I followed those steps and upon restarting the PC I only got an empty blue boot screen after which the PC shut down. I was about to freak out but I powered on with F12 pressed, and BIOS gave me the option to boot from Boot Menu. Then the boot menu appeared complete, chose the Win 10 Home and again shut down, powered on and it boot directly into Win 10 Home (weird behavior). Then I restarted, with F12 chose the Win 10 Pro option and it booted into Win 10 Pro with success. So the boot menu only displays successfully if I press the F12 key upon restart (before it would show up automatically). How can I repair this boot menu issue? Screenshot of MSConfig as it looks now. . Also, can I remove the T letter assignment of Disk 1? Thanks

Have a look at the bcd store with bootice
BOOTICEx64-1.3.3-dll.zip

UPDATE: So as said earlier, the boot menu would only show if pressing F12 upon restart. I noticed that "Windows Boot Menu" was the 3rd option, so I moved it to 1st place in the boot sequence within BIOS and that seemed to have fixed the issue, now the blue boot menu displays correctly upon restart/power on. The last thing to check is if I can remove the letter assignment of the Windows 10 Home drive (as suggested by Navy), and if so what command should I apply so that it does not mess with the boot behavior.

diskpart
sel vol t
remove
exi

or you can do it with bootice>parts manage> highlight partition T >remove drive letter

SIW2 said:

diskpart
sel vol t
remove
exi

or you can do it with bootice>parts manage> highlight partition T >remove drive letter

Can I also do it from Control Panel/Computer Management/Disk Management/Right click on drive and Change Drive letter/Remove?
My concern is if after removing the drive letter, if the drive will be bootable? Because as seen in the MSConfig screenshot, the drive shows as "Windows 10(T:\Windows)"

bcd doesnt store the drive letter. It is just an alias for your convenience.

SIW2 said:

bcd doesnt store the drive letter. It is just an alias for your convenience.

Yes, removed the drive letter and boot menu works as expected, thanks