I am working on a project that has a lot of angles. I have never figured out how to use my reference coordinate system to move things in the correct plane. Any help would be appreciated. Here is a screen capture of what I am talking about.

I am working on a project that has a lot of angles. I have never figured out how to use my reference coordinate system to move things in the correct plane. Any help would be appreciated. Here is a screen capture of what I am talking about.

Grid
I added a helper grid, rotated it, and used that as my coordinate. Is this the best way?
Draw a grid (it’s a helper object). Use autogrid to put it on the correct surface. Right click on it and select “activate grid.” Now on the coordinate system pull down, choose ‘grid’. Your axes will align with your new grid.
You can put multiple grids throughout the scene, and switch between them as you model the building.
Also, if you try creating splines in the top view, it will not work until you activate your home grid. (Views > Grids > activate home grid). That’s a pretty annoying bug.
Autogrid
Yes… the extras. I missed that part. I just spent the last couple weeks watching my Lyndia.com 3dsmax tutorials. Wonderful stuff and very well done. I think I learned more in the last 2 weeks then I had in the past couple years. I was working way to hard. Box modeling is awesome! If you guys haven’t check it out you should. I am doing the month to month and I am loving it.