From challenge to change you go by erasing 3 letters. Such result could be seen as an answer to " target - 3 = modification"

Similar transformations are listed bellow:

 stupid person -1 = planet’s satellite 
 defrosting -2 = entity
 issue orders -3 = fruit or meeting
 by hand -4 = more than few
 a gridlike puzzle -5 = rope made of twisted threads
 permanence to resist stress -6 = thing one has to do
 self-taught -7 = part of a play 
 not vertically -8 = sacred
 a break in certain activity -9 = a charged particle 
 relating to the face value of money -10 =an agreement

Try to recover as many as possible.