Goal attributes are inherited from Maya classic particles. The workflow for creating nParticles goals is the same as creating goals for classic particles. However, goals for nParticles may behave differently, because goals are not part of the Nucleus system, and they will not completely compensate for the wind and gravity attribute settings on the Nucleus node. If your simulation requires that the nParticles reach the goal exactly, turn on the Ignore Solver Wind and Ignore Solver Gravity attributes (on the nParticleShape node) and use Maya external gravity and wind fields instead. If you don't need your particles to reach the goal exactly, or if you like the look of the particles working against wind or gravity while trying to reach the goal, leave Ignore Solver Wind and Ignore Solver Gravity turned off.