This post is an extended question from the link above. I have covered the efficient way of doing indent in the previous question.
Like the GIF above, I finished the indent and wanted to flatten the bottom with the finish. I wanted the vertices to move numerically precisely. If the underside was aligned with the world axis, we could solve the problem by using the axis locking function and the snap function together, but we wanted to use the vertex slide function and the snap function together because the bottom surface has a different slope from the world axis.
But why Vertex slide did not work with snap in blender? So I eventually zoomed in as far as possible and placed the vertex as close as possible to the snap point on the underside.
In fact, I'm working on visuals rather than on product creation and i don't need numerical perfection. So I'm not uncomfortable using boolean cutting to flatten it. But I wanted to know more about the modeling technique, so I wrote this question.
How do I snap a vertex(vertex slide derection) to a plane with a different slope from the world axis?