If statements linked to external references

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Running Mathcad 13.

I am trying to contruct a user friendly generic format for our design verification files, one that can be used accross the product line. I currently have a list box containing the drawing numbers for each component that can change. I want the user to select the drawing number and then the mathcad file to go to a seperate file based on the drawing number selected. I know I can use the reference to direct to the seperate mathcad file, but I am having difficulty incorprating the reference command into an if statement based on the selection from the list box.

Is this something that is possible or do I need to find a different way to set up my design file.

Ex. Referenceathname here

Thanks,

Ben Holgate