That’s an interesting task! Yes, it’s somehow possible, although AxoTools is not true 3D and cannot do simple spatial boolean operations like real 3D apps. The art you get, though, is clean vector art, more easily editable in Adobe Illustrator. There are variations on this technique, but here’s an example. I used a letter without curves for simplicity.
Convert the glyph to outlines and extrude it. Use the Axo Line tool to drag a guide line along the lower back edge and convert it to a guide. Select the Axo Scale tool and click to set the anchor at the top front corner. Tap the Alt/Option key to select the top plane.
Scale the top glyph outline to snap to the guide line.
Use the Axo Shear tool, again using the top plane and same anchor point, to meet the corresponding point on the bottom surface.
Select the top points of the side surfaces and drag them downward to meet the corresponding points on the top glyph. If you have curved surfaces, you’ll need to adjust the control handles.
Now delete your guide line.
I hope this is helpful.