Program and verify the first op. When it finishes verify, click "save as stl file".
Program and go to verify on the second op. Before running it, go to "configure". On top left, select "file" from Stock/Shape. Once selected, the "stock file" dialog will become enabled. Use it to browse to where you saved the stl file. Click OK and verify it.
That's the hard way.
The easier way is to program the entire part in one file, and verify the entire thing at once. This will require the proper use of the WCS and/or Tool and Construction Planes in order to verify across multiple sides of the part, but it works much better, as you don't have to worry about the infamous waterfall effect of some stl files. (There is a tutorial available on the WCS if you want to go that route.)
HTH.
Matt
San Diego, Ca
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)