how to define sequential step ?

Hello everyone.. Consider a cantilever for sequential load steps in abaqus.
Fist step I want to apply imposed displacement of 2mm at free end.
2nd step I want impose +/-6mm Z displacement at free end (total 3
cycles. (One cycle= +6 and -6 mm in z direction)

Can somebody let me know how to do this. how to define two steps ?

Thank you in advance

Vasant