How to cut extrude inwards like in sketchup? In sketchup the extruding is similar to blender, but when I pull down it is different. I have a cube in sketchup and added 2 edges, and with the center face I pull down and it cuts to make the u shape.
Sketchup

I tried something similar in Blender, but it did not work.
After adding loop cut when pull down it created extra faces that I have delete and it adds more work to do.
Is there any method or how can i make a simple way cut or extrude downwards?
With the boolean can cut in sketchup, it's a simple way just to extrude downward and get what I want. Any suggestion or help which and make my work faster with this simple methods?
Blender
Starting with blender version 2.9 there is a way to Extrude Manifold
(Alt+E)

This tool is very similar to Extrude Faces but enables Dissolve Orthogonal Edges by default. This causes the tool to automatically split and remove adjacent faces when extruding inwards.