heckman lwage educ exper expersq, select(inlf = educ exper expersq nwifeinc age kidslt6 kidsge6)

上面的命令只是适用于双向选择的，但是如果有多项选择，怎么写命令呢?
if there is polychotomous  choice,how to write the command？
for example:
women  have  three choices:  to  be  an  enepreneur, a worker, or a  non-labor  force participant.
(if entrepreneur,inlf=2; if worker,inlf=1;if non-labor force,inlf=0)

Thanks a lot!