Better way to organize function and programs?

[Rich]

I am definitely not a programmer, but after reading Cyrille's post i came up with this method. I am not sure if this is the what the designers intended for students, but as a work around for me, it'll do. I still hope there is a better way.

1) Create a program titled after the subject. See screen 1 attachment.
   
2) Edit and enter a list of functions/equations within the program. See screen 2 attachment.
   
3) Load the program in the CAS screen. Which then loads the functions in the program list. See screen 3 and 4 attachments. (equations abc and def)
       
4) You are able to manipulate the functions like any CAS item now (at least from what I can see). See screen 5 attachment
   
5) When you are done delete the functions from the program list, so you only view the original edited program title, (ENGR123).