MacBook Windows 10 dual boot with 2 SSD inside?

I wil buy a laptop in the near Future and it wil come with 2 SSD drives of around 500 gb how can i make one run IOS? And the other one Windows 10? Wich comes pre installed (Ofcorse) I Cant find any good simple instruction Any tips ? My guess it's more simple than one hard drive. Also i already have 2 hard drives wich have my current high Sierrea back up.i can plug them in but it they wont boot right?

submitted by /u/B_okay_
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