Not sure what you mean, and if you post a screen snapshot of the parts of your model you would like to modify, it will be a big help.
I don't think what you want can easily be done, that is to edit the 3d wall's, 2d plan lines, then have the application automatically regenerate the 3d walls.
However, if you are looking for a way edit by stretching or shrinking parts of your model, one way to do it is in Camera > Parallel projection view, in one of the standard view that is best suited for the selection of the desired walls (say plan view) that you want to edit. Then select the walls you want to edit, from left to right (not the other way), and stretch or shrink the selection, with the "move tool". You may have unexpected results if part of the selected walls are groups or components, and will have to experiment to find the best way of doing this. If you are adding or deleting new walls, it's easier to do that in "Iso" view.
Btw, you can search for and use a "draw walls" plugin that will insert 3d walls in a single go.
