What is the question again?
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so if I'm deleting the partition created on my ext disk, when booted on windows.
If I reboot the windows again (note at this point the only os is windows I have deleted the partition on the ext disk) since there's mbr file on windows I'll will prompted to GRUB-rescue menu ie https://i.imgur.com/owenKtD.png (how to fix this now? or is there a way to avoid this while deleting the partition )
So before you set up on deleting or overriding any mbr...
So you want to override sda mbr with windows boot
make sure manjaro is also on sdb mbr as well
Repeat - have manjaro in sdb mbr as well.
Then go ahead and restore your windows boot on sda
In meantime you can still boot manjaro (and windows) with
And when windows boot is restored in sda,
boot windows by starting computer.
boot manjaro by "bios set-up to boot from external drive"
Then you won't get to grub rescue but to a grub menu.
Am I missing your question somewhere?
Or are you missing my answer?
@AgentS, where is your post on setting bios to boot from sda or from sdb?
I'm not sure where I'm missing.
If unsure, do both (recommended)
sudo grub-install /dev/sda
sudo grub-install /dev/sdb
sudo update-grub
I did both and this, https://i.imgur.com/agnJBA2.png (found windows on dev/sdb1)
right now I'm promoted to Manjaro screen to choose windows and manjaro.
suppose If I choose windows and boot into that and then delete the manjaro on my ext disk and restart my machine
I will not get the manjaro screen at start in addition I don't boot into windows either. (grub-rescue menu)
(or am I missing something?)
If you have set manjaro grub to both
Try it. After setting to both. Go to bios and boot from external drive. Try it first before getting windows boot on internal drive.
Do this as many times as you like to be sure you have this grub menu before fixing sda windows boot. Can you try it first before you write again the same stuff? (not to be rude, but please)
I know you want to reinstall Manjaro.
Just go ahead.
If you reinstalled manjaro (properly) you won't have a problem booting windows, right.
Of course, if you delete manjaro partition (before installing manjaro) you won't boot anything (including windows). Unless you install windows boot in sda first.
Isn't this obvious?
Seems like you missed my question,
I'm getting a GRUB menu I can boot into windows and manjaro (no problems after updating grub)
this menu (I don't have pic of previous page it has options of manjaro and windows)
Of course, if you delete manjaro partition (before installing manjaro) you wonât boot anything (including windows). Unless you install windows boot in sda first.
in windows after deleting manjaro partition I should repair the boot so that it should be free of grub.
You should repair the windows boot before deleting manjaro.
Unless you just want to reinstall Manjaro immediately and that is fine.
ok thanks for making my dumb mind clear.
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I have cleaned everything (*successfully) and about to reinstall but this comment made me to think that's my purpose is wrong,
If you fully install Manjaro to the external drive, it can run on one computer and save changes and data. But if you try to use that drive on another computer, it probably wonât work, since the hardware (especially video) is different
from this
well, whatever I'm installing it again no matter what
where to specify Mbr to install on hard disk. https://i.imgur.com/YLnJCc2.png (I don't find any options here)
This comment was made some time ago but now we have 'video-linux' now, non-proprietary graphic driver. Install 'non-free' and you'll be fine. Linux progresses fast, ya?
I think, slightly further down in the installation at "bootloader" installation.
Choose the external drive (if you want windows boot on the internal drive).
Again the reminder to check disk notation using 'lsblk -f'.
And anyway, unless you mess up real big time, there's this link you used (and helped) that you can get back.
I don't think I've said this before (more to the contrary) but 'you're playing it too safe'.
Be 'reckless' for a change. You might learn something if it does not work out.
As they say, "Experience is what you get when you don't get what you want."
And experience is a great teacher. 
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Be ârecklessâ for a change. You might learn something if it does not work out.
I get it. I don't even know what GRUB was when I installed.
this just increased my interest overall (soon or later I'm going to migrate fully), really thanks for spending time.
Edit: I posted your guide in r/ManjaroLinux yesterday for someone who had prob with grub, it seems he fixed and thanked me (felt unfair) so I'm letting you know you're doing a great job.
Just to raise a thing which should not be missed.
If you don't have any Linux/Manjaro installation on internal drive, you have to "Repair Windows boot" with a Windows method. Most common is with a windows installer disk. Because you won't be able to boot internal Windows without external drive attached.
And I suggest you don't install grub to internal drive, unless it's a rescue action (I mean for a permanent setup).
I hope you won't get lost in the so many suggestions 
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Thanks, I did repair my windows boot (using command prompt and repair tool)
P.s: I have installed grub on ext disk (/) this time and Running Manjaro..
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