EasyBCD is gui for BCDEDit. so here is what happens:
BCDBoot copies the boot files to either the EFI system partition, or the partition specified by the /s option.
/s
<volume letter> Use this setting to specify a system partition when you are configuring a drive that will be booted on another computer, or a secondary hard drive. (There must be a partition with the same drive letter as used.)
BCDBoot creates the BCD store in the same partition.
cmd prompt as admin "type bcdboot C:\Windows /s J: /addlast"
so this will allow you to boot from J

partition) where you installed your options OS.
then open logo + R --type msconfig then click ok - scan over to boot - then you can view if you did proper.
Learn to create and manage boot entries in Windows using BCDEdit commands. Configure multi-boot menus and customize boot options. Start optimizing now.
docs.microsoft.com