DRAW

 
draw0a

From the Materials tab select the "Carve" material. Using the drawing pen draw a shape in a single stroke..

draw1

This will produce the mesh above in "UNION" mode with "Cut Through" turned off.

draw00
Instead of a single stroke, you can also first sketch the outlines of the shape using the "Sketch" material.
draw00a filltool
Switch back to the "Carve" material. With the "Fill" tool fill inside the lines.
draw11a
As usual this will produce a mesh also.
draw000
You can draw multiple shapes.
draw111a
The new shapes will be converted to mesh all at once. Notice they will share the same material. This is because new material are created per operation.