If that is the end result, I would take another approach. Start with a rectangle. Use ctrl R along with middle mouse wheel to add the amount of cuts you want in each direction. Then use the Knife Exact tool to cut the angles on the ends. Use ctrl LMB to snap the start and end points to the verts you want. Then delete the faces you don’t want on the ends to make the shape.
that is a very clever solution… I’m a bit constrained because I have the shape of the structure I’m trying to do this to…it’s something like the picture below, but with more severe angles (for drama) as you could see in my original image.
If the shape that I have now is a given, am I stuck with the slanted cuts, or is there a way to get the vertical cuts to be perpendicular?
I’m not sure how to do it with ctrl R. To get it to work by hand with K - Knife (exact) the sequence is LMB click drag then MMB Wheel click to conform to the XYZ. Make sure and let go, then the line will snap to the axis. after that you can adjust the length or you can do that as a part of the first LMB drag.