 - 1.) In this example, the smaller wall piece that attaches to the larger wall will have flickering issues.2.) If you select the edges and select 'Connect' under the 'Modify/edit Edges' menu, or use the cut tool, there is a good chance the edge will notbe even.3.) If you flatten the edge manually, it will most likely twist the texture and distort it like you see here.4.) If you move it, it will stretch and squash the texture.5.) The best way to get around this issue is under the 'Modify/Edit Geometry' there is an option called 'Preserve UV's' this tool works best with 3 or 4 sided faces, so be careful of this small fact.6.) Now when you move the edge up or down, it does not distort the texture.7.) Another way of cutting the face which is quicker and more accurate is the following. Select the polygon face you want to cut.8.) Under your 'Grid and Snap Settings' (right click on the snaps toggle, the magnet with a 2, 2.5 or 3 above it) and click on 'Vertex'.9.) Under the modify menu/Edit Geometry, select 'Quick Slice'.10.) On the face, click on one edge you want to create an edge on, and select the other. It will snap the edge created to the vert, and if the face has a vert that it can weld to, it will do so.11.) On a side note. If you want to quickly flatten any edge, vert or face, this is a good trick to make sure it's completely flattened. When you select any edge, vert or face, you get your orientation tool which shows what direction it is facing.Red - XGreen - YBlue - ZIf you want to flatten your face in say the X axis, make sure you have the middle or bottom button of your 'Select and non-uniform scale' button, located to the left of your 'view' drop down. Also on the bottom of your max, click on the 'Absolute mode transform Type-in'. Once that is selected, the read out for the X, Y and Z axis will all read 100. To flatten on the X axis, type in 0 in the place of the 100, and your edge, vert or face will be flattened along this axis.12.) And finally, when you have finished cutting your geometry, don't forget to delete the un-wanted face, and weld the verts after. 3D Max does not allow for more than two faces to be assigned to a single edge, unlike some applications such as Maya, so the welding must be done after the face is deleted.