Reference to outside worksheet within FOR loop

I'm a relatively new user of Mathcad, using the latest version (12). I have a fairly involved sheet that uses the Minerr function to solve a set of nonlinear equations in three variables. I'd like to insert this sheet as a reference into another sheet from within a FOR loop (sort of like calling a subroutine), so that I can iterate the input variables in the equations. Is there a way to insert a reference into a FOR loop?