write a trigger on position, when ever a position is created or edited position history object automatically entered or updated in position history object
create one position history sobject with following field title,grade,type(full time,part time),min pay,max pay,created date ,created by(user).write a trigger when ever a position is created or edited the following data should automatically entered or updated in position history object
Have you tried enabling "History Tracking" for your Position object and required fields in it?