I'am using the derived "skelleton-1.ipt" in the file "solid-1.ipt".
The "skelleton-1.ipt" contains the sketch "sketch-A".
The "solid-1.ipt" contains the feature "extrusion-A" based on "sketch-A" of "skelleton-1.ipt"
When I make a saveas copy of "skelleton-1.ipt" to "skelleton-2.ipt",
how is it possible to interchange the "sketch-A" of "skelleton-1.ipt" by "sketch-A" of "skelleton-2.ipt" without making a mess of "extrusion-A"? So interchanging the sketch on which an extrusion is based.