Multiboot environment and grub editing

I have an SSD with 4 partitions. Win 10 64 bit, Zorin 16.3 and Win 10 32 bit. Grub boots Zorin fine and windows 10 32 bit @ sdc1 and zorin is on sdc7. Win 10 64 is on sdc2 while the 32 bit is at sdc3. How do I edit grub to start win 10 64 on sdc2. sdc1 is a fat partition of 500mb. I am using grub customizer to edit grub files.

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Fixed it. Used Macrium Reflect to fix the Windows boot problem which gave me back the selection of 32 bit or 64 bit but was faced with Zorin not booting. Loaded live DVD and ran Boot repair. All sorted.

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