Is there a method to quickly design your own profiler. For example, if I already have a complex model (formula) with several independent variables, can I set up my own profiler to see the impacts of individual independent variables?
Yes, I do this all the time. Make a table with 2 rows, one column for each of the variables in your function and one column to paste the function formula into. Add values for the min on one row and the max on the 2nd row.
Under the Graph tab, select Profiler, give it your formula column, and you're good to go.