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In Sketch™, there are 5 Section Options Tools to choose from when working with a BIM File.  The Section Options Tools give you different Camera perspectives of your BIM Model based on the Plane selected (X,Y,Z) and the point on that axis you select. You can access the Section Options Tools by clicking on the Section Options Dropdown option in the Top Menu.

Section Options Tools:

Box

The Box Section Option shows you a Box Segment of your Model. 

Z Plane Only

The Z Plane Section Option Tool gives you the option of viewing from 0 to 100% of your Model on the Z Plane.

Y Plane Only 

The Y Plane Section Option Tool gives you the option of viewing from 0 to 100% of your Model on the Y Plane. 

X Plane Only 

The X Plane Section Option Tool gives you the option of viewing from 0 to 100% of your Model on the X Plane. 

Reset All

The Reset All Tool clears out any Section Options you have set.