Question: Is there a way to move the boot partition from HDD to SSD(NVME) while the OS partition is already on the SSD partition without loosing any data and reinstalling w10?
When I was installing w10 on SSD, the installer created boot partition on HDD which I didn’t unplugged before the installation.I would like to avoid formatting SSD with OS partition and reistalling the w10 (and all the soft) in order to place booting partition on the same SSD as OS is located.

Answer:Execute from elevated command prompt:
(if you get any errors, then stop immediately)
diskpart​list disk​select disk 3​list partition​select partition 1​(select 465GB partition)​shrink desired=500​create partition primary​active​format fs=ntfs quick​assign letter=H​exit​bcdboot c:windows /s H:​​How to open elevated command prompt:
How to Open the Command Prompt as Administrator in Windows 8 or 10Much of the time, opening the Command Prompt as a regular user is all you need. Sometimes, though, you ll need to open the Command Prompt as an administrator so that you can run commands that require administrative privileges.www.howtogeek.com
After this is done, reboot your pc, go into BIOS and set SSD as first in boot order. Newly created partition will now have description “System” in Disk Management.