TCL scripting

Hii,

i am a beginner in tcl scripting and came across a design problem.

Of multiple qsys present in my project, i want to select a particular qsys and then select a particular ip in that qsys and then i want to enable/disable it based on user input. this i want to do using tcl script. i got some suggestion to do it using ELABORATION CALLBACK. i have attched my tcl script below but i have no idea how this tcl script will execute in quartus elaboration process. do i need to update qsf for that. please provide some suggestion. also i request to please check my script for any error.

thanks.