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How to go from dual boot to triple boot sierra+windows+mojave?

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I currently have Sierra + Windows on separate SSD drives since 2016. What would be the process for installing Mojave on a third internal SSD. I tried installing mojave to an external SSD but I could not finish the install process as the bootloader does not show the Mojave SSD after restarting even though it seemed to be installing and I believe the EFI for the Mojave SSD is empty after mounting it on Sierra. Tried this method on other macbook and mojave installed on the external SSD & booted. What gives.
 

Going Bald

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What file format is the Mojave drive? HFS+ or APFS? If APFS, you will need to update Clover on the Sierra drive or install Clover on the Mojave drive to be able to boot it.
 
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GA-Z170MX-Gaming 5
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GTX 980 Ti
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What file format is the Mojave drive? HFS+ or APFS? If APFS, you will need to update Clover on the Sierra drive or install Clover on the Mojave drive to be able to boot it.
I would be purchasing a Crucial MX500 SSD after succeeding with the Samsung
Portable SSD T5. PS. I succeeded in getting the
Samsung
Portable SSD T5 with Mojave but could not get the Intel HD graphics to be used & recognized after following some tutorials & messing around I decided to start again. So I attempted to reinstall with Mojave USB but the computer will not recognize the Mojave USB anymore and so I can not boot from it. Any ideas.?
 
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Have you managed to accomplish this?
 
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GTX 980 Ti
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Not yet but about to clone Main drive to Samsung SSD 860 EVO and then attempt a Mojave update on the clone. First have to pickup the SSD from Best buy.
 
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