You may want to split parts into multiple pieces. For instance, if you want to print sections in different colors or if the whole piece is too large for your printer. In this case I am going to split Iron Man's thigh into the gold section and the red section.
We need to select the line where the cut will be made. Select one edge and then keep selecting more using SHIFT or CTRL.
CTRL makes it easy by selecting the shortest path between the first line and the one you click on.
Press V and ESC to rip the mesh along the line you selected.
Press CTRL+L to select the entire linked section, then move it away from the rest.
Press P to ungroup it from the original.
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Insert a new line below
Insert a new line above
Indent current line
Unindent current line
Delete current line
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