A. Can I touch a stone cavern side wall, and make a perpendicular stone shape protrude from it?
B. Can I touch a ton ceiling, shape a cube from it, that will therefore fall?
D. Can I shape it in this way : I touch a ceiling, take a cube of it and transform it's volume in a longer, thinner cylindric form, to make a column?
E. Can I touch the side wall of a tunnel, make a door with some thing that prevent it from moving int he ground right next to it, and open it, therefore closing the tunnel?
According to SRD :
School transmutation [earth]; Level cleric 3, druid 3, sorcerer/wizard 4
Casting Time 1 standard action
Components V, S, M/DF (soft clay)
Target stone or stone object touched, up to 10 cu. ft. + 1 cu. ft./level
Saving Throw none; Spell Resistance no
You can form an existing piece of stone into any shape that suits your purpose. While it's possible to make crude coffers, doors, and so forth with stone shape, fine detail isn't possible. There is a 30% chance that any shape including moving parts simply doesn't work.