Split Face command, how it works?

Don't use Solid Edge, but here is how it works in SolidWorks. May be similar enough to help.
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Step 1:
Part to be split
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Step 2:
Create sketch line for split. Line must fully cross faces to be split
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Step 3:
Exit Sketch
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Step 4:
Select Split Line command and select line
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Step 5:
Select faces to split
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Step 6:
Click OK and selected faces are split.