When performing well(pad) planning, a number of tools are provided in the Tools button group of the plan > Wells and the plan > Well Pads sub-strips to aid you in generating the wellbore trajectories and the wells.
For more information, see
Drilling Constraints
Creating well target zones
Creating and editing wells with the Well form
Creating perforations
Creating a wellbore cross section
Creating a pseudolog from a volume
Creating a pseudolog from well logs
Adding markers from surfaces