It sounds like your trying to show the window as removed. To do this right click on the window and select PROPERTIES. In the Element Properties pop-up under Phasing do the following: set Phase Created to EXISTING and Phase Demolished to NEW CONSTRUCTION. OK your way out.
Now right click in the view and select VIEW PROPERTIES. Under Phasing set Phase Filter to SHOW COMPLETE (to show final construction with window gone) or SHOW DEMO/NEW to see the window dashed indicating to be removed.
This works for walls and family componets also. If you set the wall to exisitng, you'll need to change the view settings. The best way to see what happens is to play around with the phase settings under Properties and View Properties, to get the result your looking for. Remember you'll have to carry this process through out all your views.
Thanks. I should have clarified in my example that the window/wall being demolished would include an addition which would be used as a closet. In other words, in this case, the closet would push out 2ft from the face of the window and portion of the wall needing demolition.
It appears that the split tool is the easiest way to demolish portions of walls. It is that I am splitting walls all over the place in order for new and existing portions of the model to work out right. I literally have wall segments that are 10" wide is some places. It is becoming both tedious and messy. I suppose that is a small price to pay when modeling.
Yes, this can become messy. However, think about how the workmen woula actually do this. Would they take out 10" wide stips, or would they take out a larger chunk, and then put new walls back into fill in the demoed areas?
What do you do when you have an existing wall that you want to Demolish only a portion of these existing for a new window opening without breaking the wall down, and show in Elevation view the Demolished portion ?
The system is smart enough so that if a door or window is placed in an existing wall, and the door or window is placed as new construction, it will automatically demo a hole or opening in that wall, without your doing anything else.