I'm not sure I totally understand what you're trying to do, but have you ever tried using smit ?

smit stands for System Management Interface Tool. Unless I'm mistaken, it's an IBM product that ships with AIX. I.E. Only AIX has it. It provides a simple menu structure to a lot of the seldom used system management stuff.

A neat thing about it is, it creates a log of the actual commands used to do what you've asked it to do. Therefore, you could actually look at THAT and create a script if there's something complicated you do often.

While not too complicated, that's how I created a script to add users.