The Split Line 
tool projects an entity (sketch, solid, surface, face, plane, or surface spline) to surfaces, or curved or planar faces. It divides a selected face into multiple separate faces. You can split curves on multiple bodies with one command.
You can create the following split lines:
| Projection |
Projects a sketch on a surface. You can pattern split line features that were created using projected curves. |
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You can create split lines using sketched text. This is useful for creating items such as decals.
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| Silhouette |
Creates a split line on a cylindrical part. |
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| Intersection |
Splits faces with an intersecting solid, surface, face, plane, or surface spline. |
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When you create a split line with an open profile sketch, the sketch must span at least two edges of the model.