Open a mainframe file in append mode in clist

Open a mainframe file in append mode in clist

Can any one please help me to open a mainframe file in clist in append mode?   I know to open a file in output mode we do the following.   First we allocate a new file   ALLOC DA(‘&PS’) F(OUTFIL) NEW SPACE(20 20) TRACKS RELEASE + LRECL(80) RECFM(F B) DSORG(PS) and then we open it using the following   OPENFILE OUTFIL OUTPUT  

I want to open the file such that it can be modified each time its open and does not overwrite what is already written in the file