GregValiant 983
To cut it into smaller pieces you would need a program like MS 3D Builder or Blender. You can do it in Cura using Support Blockers configured to Modify Settings for Overlaps and then as Cutting Mesh. You select: Walls, Top and Bottom layers, and Infill and set them all to Zero for the blocker that is now a mesh modifier. You scale the Mesh Modifier and move it around until you get it where you want it to block part of the model from printing.
You can also turn off "Automatically drop models to build plate" and move part of the model below the Cura build plate. What's left above will slice. Then you can print the rest upside down or whatever you need.
I usually do it in CAD because I can, but if all I've got is the STL then I use MS 3D Builder. It's not real intuitive, but it works pretty well.
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GregValiant 983
It's in Preferences / Configure Cura and on the General tab. It should be about the second box down.
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