Storing an equation then change one variable repeat transfer function

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Hi i am using the trial version and I am very new to this.

I have created a transfer function and in it's denominator (which has 5 terms) I have an equation expressed as

den = [c2^2*r2^2*c4*r4 c2^2*r2^2*c4+2*c2*r2*c4^2*r4 c2^2*r2^2*c4*r4+2*c2*r2*c4*r4+c2^2*r2^2+c4^2*r4+2*c2*r2*c4 2*c2*r2+c4*r4+c4 1]

When I save and reload my workspace it seems I have to re-enter this equation if I want to change one variable to a new value so I am able to obtain a new transfer function, bode or nyquist plot.

Is there a way to store this equation, expressed algebraically as shown above, so that if I change one variable (after reloading my workspace) I do not have to retype(cut/paste) this expression?

Cheers

Dave