This tutorial walks through the steps to manually create the Boot Camp partition. Open Utilities -> Disk Utility and:
1. Select the drive.
2. Select the Partition tab
3. Click + to add a partition
Note: Make sure that the partition map scheme is a GUID Partition Table. If it is not, then you'll need to repartition the entire drive and select GPT under Options in order to use Winclone to restore an image. This is the standard partition scheme on the Mac.
OS X 10.8.3: Fusion drives and standard 3TB drives should use Boot Camp Assistant rather than Disk Utility to create the Boot Camp partition.
Set File System type
Format the new Boot Camp partition as MS-DOS (FAT). The file system will become NTFS during the process of restoring the Winclone image.
1. Select the new partition.
2. Set the format to MS-DOS (FAT)
You can now drag the divider handle to set the size you would like for the Windows partition and the Mac partition. For restoring with Winclone, remember that the new Windows partition should be set to at least 1-2GB larger than the original partition.
Give the new partition an easily recognizable name or leave as the default UNTITLED.
Click Apply to resize the Mac partition and create a new Windows partition.
Disk Utility will verify the operations it is about to perform. Make sure that the Boot Camp partition is being added and the Mac partition is being resized. If this is correct, click Partition.