It is not clear what you wanted. But what I get from your question is you want to edit the inp file and add more than 1 steps by editing the inp file. So, to do that you can just add *STEP......*END STEP, and start a new step by again *STEP....*END STEP. Here is an example:
*STEP
**Add boundary, load, and necessary things
....
*END STEP
** 2nd step will start here
*STEP
** Add boundary,load an necessary things for this step
Thanks for your valuable replies, Actually i want to depict the construction phase of DAM for that i am using the Model change feature depicting each lift activation.So I have to add around 216 steps for representing 216 lifts.Doing it manually will be tedious task.I have not yet submitted my job so its inp is not yet generated.So i finally did that by recording a single step and then edit it and applying loop to it and thereafter running the script.