You can split a path, graphics frame, or empty text frame at any anchor point or along any segment. When you split a path, keep the following in mind:
If you want to split a closed path into two open paths, you must slice in two places along the path. If you slice a closed path only once, you get a single path with a gap in it.
Any paths resulting from a split inherit the path settings of the original path, such as stroke weight and fill color. You may need to reset stroke alignment from inside to outside.