There are couple things you could do:
First would be to make a separate solid model depicting what you have intended, or as close as possible. You would use this as the basis for your second op. Sometimes that is a simple proposition, and other times, not so much, depending on the complexity of the part and the stock you are working with.
The other option, and I would use this route only if the first option isn't practical:
CAM Simulation, turn Stock on, mode set to Standard (not Fast 3 axis). Run Simulation to the end on the first op. Right click, Stock, Save Stock.
This will save the stock as an .stl. You can then import the .stl, but you first need to turn off History, click on Insert, and then Insert Mesh. Don't forget to turn your History back on!
And it's often the case that the mesh needs to be imported in MM form, regardless of the parent document units
Seth Madore
Owner, Liberty Machine, Inc.
Good. Fast. Cheap. Pick two.