Just check INISTATE command syntax.
ANSYS HELP: INISTATE, Action, Val1, Val2, Val3, Val4, Val5, Val6, Val7, Val8, Val9
Command at line 4 will define Pre-Strain (EPEL at line 2) for Element have ID = 11.
Check information in Solution Information:
I think this is not the same as your idea, you want to apply Body Pre-Strain not Element, right?