Using bolted connection, I want to place a bolt through 3 sheets of metal. The first 2 sheets i want it to automatically place a slightly larger hole (which it does) but I want the 3rd sheet to be threaded so the bolt thread and hole thread are the same size. What is the best way of going about this problem.
Just create the threaded hole beforehand. If you are relatively new to Inventor, I would make one more suggestion - place all holes beforehand. I have used bolted connection since it first came out and you will run into more problems if you let it make the holes for you. Just my $0.02.
Although I agree with you - that is the intended way to do it, (Press "..." next to the hole in bolted connection dialog and change to threaded) my last email was just a cautionary one that more often than not, the holes created through the bolted connection generator will cause issues down the road. If you don't edit things often you should be OK.