i created the base model, and saved as obj, simple sliding window in closed position
then edited it to the "open" position, and saved as obj again
the first time, the base was done but i had to save and leave, then later created open, 2nd time around i tried it all in 1 session to be sure that nothing was changed between the 2 steps

as for importing, tried it both ways =P first time around that stuff doesnt work right off, i click random options to see effect, just to rule out difference between the modelling apps. neither worked =S