Hello, after searching the forum and googling I was not able to find what is causing the issue that I am facing. I am trying to do something fairly simple, i.e. cut out a window on a sloping roof. It works for the outer face, but not the inner face, for some reason. I have tried redrawing the faces, measuring them and checking that they are parallel, ungrouping them, using the push/pull tool, but I just can’t get the window to separate from the roof face. What am I missing?
Roof_issue.skp (310.8 KB)
The two faces of your roof are not parallel, so push pull will not cut like it normally would.
It can work if you pull through and intersect.
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@Box I literally just tried that and it worked. I was about to post my finding, but you beat me to it. 
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Thanks for the quick reply, but what do you mean they are not parallel? Measurements look ok to me, only one coordinate changing between them. Anyway your method worked for me, learned something new today. Not sure I understood what it does though!
The tildes in the coordinates show it is off.
Turn off length snapping in model info Units, this tends to create errors.
Also you have tagged raw geometry, don’t do that. only tag groups/components, leave all raw geometry untagged and always leave untagged as the active tag.
You can see the face isn’t parallel when you pushpull, you can see it creates two faces.
Why should I not tag my geometries? The roof is just a tiny part of a three story building, I use tags to hide each individual story individually when working on them. Otherwise it makes navigation impossible. I could of course have grouped everything nicely, but it’s kind of too late for that now because when I started out I was drawing my own furniture right onto the walls so that everything is now nicely welded together (but then again I don’t know how else to do it, since I am drawing the furniture so that it is tailored to the room) 
Unless you are an expert and fully understand the consequences, putting tags onto edges or faces risks serious confusion such as things that aren’t visible when you think they should be. The wisdom of the experts, based on helping a great many newbies, is that only groups, component instances, and non-geometry such as dimensions, text, and images should receive tags.
There is nothing about limiting tags to groups and components that makes this impossible. The edges and faces from the groups and components tagged “second floor” will disappear along with their containers when that tag is turned off.
Further, the advice is that every item in your model that can be conceived as a “thing” should be made into a group or component as soon as possible. Cleaning up the model once it has become a mass of entangled edges and faces can be very tedious and error-prone, so much so that it is often easier to delete the mess and start over!
If the walls etc were groups or components, you could draw your furniture based on them without opening the group for edit - you will get inferences for snapping to edges, faces, and vertices even if the group is not open. So, there is no advantage to not grouping the walls, floors, ceilings, etc. just to add tailored furniture. You should draw the geometry for a single piece of furniture and then make it a group or component before drawing anything more. Then it won’t become entangled with the next piece you draw.
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