Andy101 wrote:
To remove the main entrance from a hold:
Whilst on the main level building screen simply cut the entrance room from the first level of your hold and paste it into a different level.
Et Voila!
You now have a hold without a main entrance.
Disclaimer: Contrary to appearances my aim in life is not to find as many bugs in DROD as possible. 
Woo hoo! Keep up the bug finding! My son was making a level and lost the main entrance, but I couldn't figure out how he did it. Now I know (I think). Now if the level's main entrance room is being removed to a different level, it will copy the room instead.
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Gandalf? Yes... That's what they used to call me.
Gandalf the Grey. That was my name.
I am Gandalf the White.
And I come back to you now at the turn of the tide.
